In the Vedas there are three kāṇḍas, or divisions: karma-kāṇḍa, jñāna-kāṇḍa and upāsanā-kāṇḍa. The karma-kāṇḍa portion stresses the execution of fruitive activities. But ultimately it is advised that one abandon both karma-kāṇḍa and jñāna-kāṇḍa (speculative knowledge) and accept only upāsanā-kāṇḍa, or bhakti-kāṇḍa. One cannot attain love of Godhead by executing karma-kāṇḍa or jñāna-kāṇḍa. But by dedicating one's karma, or fruitive activities, to the Supreme Lord, one may be relieved from the polluted mind, and becoming free from mental pollution helps elevate one to the spiritual platform. Then, however, one needs the association of a pure devotee, for only by a pure devotee's association can one become a pure devotee of the Supreme Personality of Godhead, Kṛṣṇa. When one comes to the stage of pure devotional service, the process of śravaṇaṁ kīrtanam is very essential. By executing the nine items of devotional service, beginning with śravaṇaṁ kīrtanam, one is completely purified.
(Sri Caitanya Caritamrta-----2:9:263-----purport).

The Vedas are divided into three divisions—karma-kāṇḍa, jñāna-kāṇḍa and upāsanā-kāṇḍa. These are activities dealing with fruitive work, empiric philosophical speculation and worship. There are recommendations in the Vedas for the worship of various demigods as well as Lord Viṣṇu. In this quotation from the Padma Purāṇa, Lord Śiva answers a question posed to him by goddess Durgā. This verse is also included in the Laghu-bhāgavatāmṛta (2.4), by Śrīla Rūpa Gosvāmī. The words viṣṇor ārādhanam refer to the worship of Lord Viṣṇu, or Kṛṣṇa. Thus the supreme form of worship is the satisfaction of the Supreme Personality of Godhead, Śrī Kṛṣṇa. It is further concluded that the worshiper of Lord Viṣṇu renders better service by worshiping the devotee of Lord Kṛṣṇa. There are different types of devotees—those in śānta-rasa, dāsya-rasa, sakhya-rasa, vātsalya-rasa and mādhurya-rasa. Although all the rasas are on the transcendental platform, mādhurya-rasa is the supreme transcendental mellow. Consequently it is concluded that the worship of devotees engaged in the Lord's service in mādhurya-rasa is the supreme spiritual activity. Śrī Caitanya Mahāprabhu and His followers mainly worship Lord Kṛṣṇa in mādhurya-rasa. Other Vaiṣṇava ācāryas recommended worship up to vātsalya-rasa.
(Sri Caitanya Caritamrta-----2:11:31-----purport).

These two verses are quoted from Śrīmad-Bhāgavatam (S.B.11:21:42-43). When Uddhava asked Kṛṣṇa about the purpose of Vedic speculation, the Lord informed him of the process of understanding the Vedic literature. The Vedas are composed of karma-kāṇḍa, jñāna-kāṇḍa and upāsanā-kāṇḍa. One who analytically studies the purpose of the Vedas understands that by karma-kāṇḍa, sacrificial activity, one comes to the conclusion of jñāna-kāṇḍa, speculative knowledge, and that after speculation one comes to the conclusion that worship of the Supreme Personality of Godhead is the ultimate. When one comes to this conclusion, he becomes fully satisfied.
(Sri Caitanya Caritamrta-----2:20:147-148-----purport).

This is a quotation from Śrīmad-Bhāgavatam (S.B.1:5:12). Even after writing many Vedic literatures, Vyāsadeva felt very morose. Therefore his spiritual master, Nāradadeva, told him that he could be happy by writing about the activities of the Supreme Personality of Godhead. Up to that time, Śrīla Vyāsadeva had written the karma-kāṇḍa and jñāna-kāṇḍa sections of the Vedas, but he had not written about upāsanā-kāṇḍa, or bhakti. Thus his spiritual master, Nārada, chastised him and advised him to write about the activities of the Supreme Personality of Godhead. Therefore Vyāsadeva began writing Śrīmad-Bhāgavatam.
(Sri Caitanya Caritamrta-----2:22:19-----purport).

Śrīmad-Bhāgavatam gives information about the personal qualities of the Absolute Truth, qualities which are beyond the impersonal aspect. Topics concerning these qualities are greater than topics of impersonal philosophical speculation; consequently Śrīmad-Bhāgavatam is given higher status than the jñāna-kāṇḍa portions of the Vedas. Śrīmad-Bhāgavatam is also greater than the karma-kāṇḍa and upāsanā-kāṇḍa portions as well because it recommends the worship of the Supreme Personality of Godhead, Śrī Kṛṣṇa, the divine son of Vasudeva. The karma-kāṇḍa portion of the Vedas is fraught with competition to reach heavenly planets for better sense gratification, and this competition is also seen in the jñāna-kāṇḍa and upāsanā-kāṇḍa portions. Śrīmad-Bhāgavatam is above all of these because it aims only at the Supreme Truth, the substance or root of all categories.
(Teachings of Lord Caitanya).

The Vedas deal with three departments of activities. One is called karma-kāṇḍa, or activities under Vedic injunction, which gradually purify one to understand his real position; the next is jñāna-kāṇḍa, the process of understanding the Absolute Truth by speculative methods; and the third is upāsanā-kāṇḍa, or worship of the Supreme Personality of Godhead and sometimes of the demigods also. The worship of the demigods recommended in the Vedas is ordered with the understanding of the demigods" relationship to the Personality of Godhead. The Supreme Personality of Godhead has many parts and parcels; some are called svāṁśas, or His personal expansions, and some are called vibhinnāṁśas, the living entities. All such expansions, both svāṁśas and vibhinnāṁśas, are emanations from the original Personality of Godhead. Svāṁśa expansions are called viṣṇu-tattva, whereas the vibhinnāṁśa expansions are called jīva-tattva. The different demigods are jīva-tattva. The conditioned souls are generally put into the activities of the material world for sense gratification; therefore, as stated in the Bhagavad-gītā, to regulate those who are very much addicted to different kinds of sense gratification, the worship of demigods is sometimes recommended.
(Krsna Book).