There are many learned sages, philosophers and transcendentalists who try to conquer the senses, but in spite of their endeavors, even the greatest of them sometimes fall victim to material sense enjoyment due to the agitated mind. Even Viśvāmitra, a great sage and perfect yogī, was misled by Menakā into sex enjoyment, although the yogī was endeavoring for sense control with severe types of penance and yoga practice. And, of course, there are so many similar instances in the history of the world. Therefore, it is very difficult to control the mind and senses without being fully Kṛṣṇa conscious. Without engaging the mind in Kṛṣṇa, one cannot cease such material engagements.
(Bhagavad-Gita------2:60------purport).

Everyone has to cleanse his heart by a gradual process, not abruptly. However, when one transcends the modes of material nature and is fully situated in Kṛṣṇa consciousness, he can perform anything and everything under the direction of a bona fide spiritual master. In that complete stage of Kṛṣṇa consciousness, the kṣatriya may act as a brāhmaṇa, or a brāhmaṇa may act as a kṣatriya. In the transcendental stage, the distinctions of the material world do not apply. For example, Viśvāmitra was originally a kṣatriya, but later on he acted as a brāhmaṇa, whereas Paraśurāma was a brāhmaṇa but later on he acted as a kṣatriya. Being transcendentally situated, they could do so; but as long as one is on the material platform, he must perform his duties according to the modes of material nature. At the same time, he must have a full sense of Kṛṣṇa consciousness.
(Bhagavad-Gita------3:35------purport).

As it is stated in Bhagavad-gītā, the Lord can be known in His real nature by dint of pure devotional service only. So it is stated here that only the great devotees of the Lord who are able to clear the mind of all material dust by rigid devotional service can experience the Lord as He is. Jitendriya means one who has full control over the senses. The senses are active parts of the body, and their activities cannot be stopped. The artificial means of the yogic processes to make the senses inactive has proved to be abject failure, even in the case of great yogīs like Viśvāmitra Muni. Viśvāmitra Muni controlled the senses by yogic trance, but when he happened to meet Menakā (a heavenly society woman), he became a victim of sex, and the artificial way of controlling the senses failed. But in the case of a pure devotee, the senses are not at all artificially stopped from doing anything, but they are given different good engagements. When the senses are engaged in more attractive activities, there is no chance of their being attracted by any inferior engagements.
(Srimad Bhagavatam------1:10:23------purport).

Gādhi-suta, or Viśvāmitra: A great sage of austerity and mystic power. He is famous as Gādhi-suta because his father was Gādhi, a powerful king of the province of Kanyākubja (part of Uttara Pradesh). Although he was a kṣatriya by birth, he became a brāhmaṇa in the very same body by the power of his spiritual achievements. He picked a quarrel with Vasiṣṭha Muni when he was a kṣatriya king and performed a great sacrifice in cooperation with Maṭaṅga Muni and thus was able to vanquish the sons of Vasiṣṭha. He became a great yogī, and yet he failed to check his senses and thus was obliged to become the father of Śakuntalā, the beauty queen of world history. Once, when he was a kṣatriya king, he visited the hermitage of Vasiṣṭha Muni, and he was given a royal reception. Viśvāmitra wanted from Vasiṣṭha a cow named Nandinī, and the Muni refused to deliver it. Viśvāmitra stole the cow, and thus there was a quarrel between the sage and the King. Viśvāmitra was defeated by the spiritual strength of Vasiṣṭha, and thus the King decided to become a brāhmaṇa. Before becoming a brāhmaṇa he underwent severe austerity on the bank of the Kauśika. He was also one who tried to stop the Kurukṣetra war.
(Srimad Bhagavatam------1:19:9-10------purport).

Although Āgnīdhra, the son of Priyavrata, was practicing mystic yoga and trying to control his senses, the tinkling sound of Pūrvacitti's ankle bells disturbed his practice. Yoga indriya-saṁyamaḥ: actual yoga practice means controlling the senses. One must practice mystic yoga, to control the senses, but the sense control of a devotee who fully engages in the service of the Lord with his purified senses (hṛṣīkeṇa hṛṣīkeśa-sevanam (CC. 2:19:170) can never be disturbed. Śrīla Prabodhānanda Sarasvatī therefore stated, durdāntendriya-kāla-sarpa-paṭalī protkhāta-daṁṣṭra-yate (Caitanya-candrāmṛta 5). The practice of yoga is undoubtedly good because it controls the senses, which are like venomous serpents. When one engages in devotional service, however, completely employing all the activities of the senses in the service of the Lord, the venomous quality of the senses is completely nullified. It is explained that a serpent is to be feared because of its poison fangs, but if those fangs are broken. the serpent, although it seems fearsome, is not at all dangerous. Devotees, therefore, may see hundreds and thousands of beautiful women with fascinating bodily movements and gestures but not be allured, whereas such women would make ordinary yogīs fall. Even the advanced yogī Viśvāmitra broke his mystic practice to unite with Menakā and beget a child known as Śakuntalā. The practice of mystic yoga, therefore, is not sufficiently strong to control the senses. Another example is Prince Āgnīdhra, whose attention was drawn to the movements of Pūrvacitti, the Apsarā, simply because he heard the tinkling of her ankle bells. In the same way that Viśvāmitra Muni was attracted by the tinkling bangles of Menakā, Prince Āgnīdhra, upon hearing the tinkling bangles of Pūrvacitti, immediately opened his eyes to see her beautiful movements as she walked. The prince was also very handsome. As described herein, his eyes were just like the buds of lotus flowers. As he opened his lotuslike eyes, he could immediately see that the Apsarā was present by his side.
(Srimad Bhagavatam------5:2:5------purport).

Vasiṣṭha: The great celebrated sage among the brāhmaṇas, well known as the Brahmarṣi Vasiṣṭhadeva. He is a prominent figure in both the Rāmāyaṇa and Mahābhārata periods. He celebrated the coronation ceremony of the Personality of Godhead Śrī Rāma. He was present also on the Battlefield of Kurukṣetra. He could approach all the higher and lower planets, and his name is also connected with the history of Hiraṇyakaśipu. There was a great tension between him and Viśvāmitra, who wanted his kāmadhenu, wish-fulfilling cow. Vasiṣṭha Muni refused to spare his kāmadhenu, and for this Viśvāmitra killed his one hundred sons. As a perfect brāhmaṇa he tolerated all the taunts of Viśvāmitra. Once he tried to commit suicide on account of Viśvāmitra's torture, but all his attempts were unsuccessful. He jumped from a hill, but the stones on which he fell became a stack of cotton, and thus he was saved. He jumped into the ocean, but the waves washed him ashore. He jumped into the river, but the river also washed him ashore. Thus all his suicide attempts were unsuccessful. He is also one of the seven ṛṣis and husband of Arundhatī, the famous star.
(Srimad Bhagavatam------1:9:6-7------purport).

The most prominent son of Māndhātā was Ambarīṣa, his son was Yauvanāśva, and Yauvanāśva's son was Hārīta. These three personalities were the best in the dynasty of Māndhātā. Purukutsa, another son of Māndhātā, married the sister of the snakes (sarpa-gaṇa) named Narmadā. The son of Purukutsa was Trasaddasyu, whose son was Anaraṇya. Anaraṇya's son was Haryaśva, Haryaśva's son was Prāruṇa, Prāruṇa's son was Tribandhana, and Tribandhana's son was Satyavrata, also known as Triśaṅku. When Triśaṅku kidnapped the daughter of a brāhmaṇa, his father cursed him for this sinful act, and Triśaṅku became a caṇḍāla, worse than a śūdra. Later, by the influence of Viśvāmitra, he was brought to the heavenly planets, but by the influence of the demigods he fell back downward. He was stopped in his fall, however, by the influence of Viśvāmitra. The son of Triśaṅku was Hariścandra. Hariścandra once performed a Rājasūya-yajña, but Viśvāmitra cunningly took all of Hariścandra's possessions as a dakṣiṇa contribution and chastised Hariścandra in various ways. Because of this, a quarrel arose between Viśvāmitra and Vasiṣṭha. Hariścandra had no sons, but on the advice of Nārada he worshiped Varuṇa and in this way got a son named Rohita. Hariścandra promised that Rohita would be used to perform a Varuṇa-yajña. Varuṇa reminded Hariścandra repeatedly about this yajña, but the King, because of affection for his son, gave various arguments to avoid sacrificing him. Thus time passed, and gradually the son grew up. To safeguard his life, the boy then took bow and arrows in hand and went to the forest. Meanwhile, at home, Hariścandra suffered from dropsy because of an attack from Varuṇa. When Rohita received the news that his father was suffering, he wanted to return to the capital, but King Indra prevented him from doing so. Following the instructions of Indra, Rohita lived in the forest for six years and then returned home. Rohita purchased Śunaḥśepha, the second son of Ajīgarta, and gave him to his father, Hariścandra, as the sacrificial animal. In this way, the sacrifice was performed, Varuṇa and the other demigods were pacified, and Hariścandra was freed from disease. In this sacrifice, Viśvāmitra was the hotā priest, Jamadagni was the adhvaryu, Vasiṣṭha was the brahmā, and Ayāsya was the udgātā. King Indra, being very satisfied by the sacrifice, gave Hariścandra a golden chariot, and Viśvāmitra gave him transcendental knowledge. Thus Śukadeva Gosvāmī describes how Hariścandra achieved perfection.
(Srimad Bhagavatam------9:7------summary).

The son of Triśaṅku was Hariścandra. Because of Hariścandra there was a quarrel between Viśvāmitra and Vasiṣṭha, who for many years fought one another, having been transformed into birds.
Viśvāmitra and Vasiṣṭha were always inimical. Formerly, Viśvāmitra was a kṣatriya, and by undergoing severe austerities he wanted to become a brāhmaṇa, but Vasiṣṭha would not agree to accept him. In this way there was always disagreement between the two. Later, however, Vasiṣṭha accepted him because of Viśvāmitra's quality of forgiveness. Once Hariścandra performed a yajña for which Viśvāmitra was the priest, but Viśvāmitra, being angry at Hariścandra, took away all his possessions, claiming them as a contribution of dakṣiṇā. Vasiṣṭha, however, did not like this, and therefore a fight arose between Vasiṣṭha and Viśvāmitra. The fighting became so severe that each of them cursed the other. One of them said, "May you become a bird," and the other said, "May you become a duck." Thus both of them became birds and continued fighting for many years because of Hariścandra. We can see that such a great mystic yogī as Saubhari became a victim of sense gratification, and such great sages as Vasiṣṭha and Viśvāmitra became birds. This is the material world. Ābrahma-bhuvanāl lokāḥ punar āvartino 'rjuna (B.G.8:16). Within this material world, or within this universe, however elevated one may be in material qualities, one must suffer the conditions of birth, death, old age and disease (janma-mṛtyu jarā-vyādhi (B.G.13:9). Therefore Kṛṣṇa says that this material world is simply miserable (duḥkhālayam aśāśvatam (B.G.8:15). The Bhāgavatam says, padaṁ padaṁ yad vipadām: (S.B.10:14:58) at every step here there is danger. Therefore, because the Kṛṣṇa consciousness movement provides the opportunity for the human being to get out of this material world simply by chanting the Hare Kṛṣṇa mantra, this movement is the greatest benediction in human society.
(Srimad Bhagavatam------9:7:7-------translation and purport).

When Jamadagni was killed by the sons of Kārtavīryārjuna, as described in this chapter, Paraśurāma rid the entire world of kṣatriyas twenty-one times. This chapter also describes the descendants of Viśvāmitra.
When Jamadagni's wife, Reṇukā, went to bring water from the Ganges and saw the King of the Gandharvas enjoying the company of Apsarās, she was captivated, and she slightly desired to associate with him. Because of this sinful desire, she was punished by her husband. Paraśurāma killed his mother and brothers, but later, by dint of the austerities of Jamadagni, they were revived. The sons of Kārtavīryārjuna, however, remembering the death of their father, wanted to take revenge against Lord Paraśurāma, and therefore when Paraśurāma was absent from the āśrama, they killed Jamadagni, who was meditating on the Supreme Personality of Godhead. When Paraśurāma returned to the āśrama and saw his father killed, he was very sorry, and after asking his brothers to take care of the dead body, he went out with determination to kill all the kṣatriyas on the surface of the world. Taking up his axe, he went to Māhiṣmatī-pura, the capital of Kārtavīryārjuna, and killed all of Kārtavīryārjuna's sons, whose blood became a great river. Paraśurāma, however, was not satisfied with killing only the sons of Kārtavīryārjuna; later, when the kṣatriyas became disturbing, he killed them twenty-one times, so that there were no kṣatriyas on the surface of the earth. Thereafter, Paraśurāma joined the head of his father to the dead body and performed various sacrifices to please the Supreme Lord. Thus Jamadagni got life again in his body, and later he was promoted to the higher planetary system known as Saptarṣi-maṇḍala. Paraśurāma, the son of Jamadagni, still lives in Mahendra-parvata. In the next manvantara, he will become a preacher of Vedic knowledge.

In the dynasty of Gādhi, the most powerful Viśvāmitra took birth. By dint of his austerity and penance, he became a brāhmaṇa. He had 101 sons, who were celebrated as the Madhucchandās. In the sacrificial arena of Hariścandra, the son of Ajīgarta named Śunaḥśepha was meant to be sacrificed, but by the mercy of the Prajāpatis he was released. Thereafter, he became Devarāta in the dynasty of Gādhi. The fifty elder sons of Viśvāmitra, however, did not accept Śunaḥśepha as their elder brother, and therefore Viśvāmitra cursed them to become mlecchas, unfaithful to the Vedic civilization. Viśvāmitra's fifty-first son, along with his younger brothers, then accepted Śunaḥśepha as their eldest brother, and their father,Viśvāmitra, being satisfied, blessed them. Thus Devarāta was accepted in the dynasty of Kauśika, and consequently there are different divisions of that dynasty.
(Srimad Bhagavatam------9:16------summary).