Thorn trees generally grow in deserted places, not in sandalwood forests, but the seminal brāhmaṇas Ṣaṇḍa and Amarka compared the dynasty of the Daitya Hiraṇyakaśipu to a sandalwood forest and compared Prahlāda Mahārāja to a hard, strong thorn tree that could provide the handle of an axe. They compared Lord Viṣṇu to the axe itself. An axe alone cannot cut a thorn tree; it needs a handle, which may be made of the wood of a thorn tree. Thus the thorn tree of demoniac civilization can be cut to pieces by the axe of viṣṇu-bhakti, devotional service to Lord Kṛṣṇa. Some of the members of the demoniac civilization, like Prahlāda Mahārāja, may become the handle for the axe, to assist Lord Viṣṇu, and thus the entire forest of demoniac civilization can be cut to pieces.
(Srimad Bhagavatam----7:5:17----purport).

In this verse the words matir na kṛṣṇe refer to devotional service rendered to Kṛṣṇa. So-called politicians, erudite scholars and philosophers who read Bhagavad-gītā try to twist some meaning from it to suit their material purposes, but their misunderstandings of Kṛṣṇa will not yield them any profit. Because such politicians, philosophers and scholars are interested in using Bhagavad-gītā as a vehicle for adjusting things materially, for them constant thought of Kṛṣṇa, or Kṛṣṇa consciousness, is impossible (matir na kṛṣṇe). As stated in Bhagavad-gītā (18.55), bhaktyā mām abhijānāti: only through devotional service can one understand Kṛṣṇa as He is. The so-called politicians and scholars think of Kṛṣṇa as fictitious. The politician says that his Kṛṣṇa is different from the Kṛṣṇa depicted in Bhagavad-gītā. Even though he accepts Kṛṣṇa and Rāma as the Supreme he thinks of Rāma and Kṛṣṇa as impersonal because he has no idea of service to Kṛṣṇa. Thus his only business is punaḥ punaś carvita-carvaṇānām (S.B.7:5:30)—chewing the chewed again and again.
(Srimad Bhagavatam----7:5:30----purport).

Kṛṣṇa consciousness, devotional service to Kṛṣṇa, is the ocean of eternal bliss. In comparison to this eternal bliss, the so-called happiness of society, friendship and love is simply useless and insignificant. One should therefore not be attached to temporary things. One should take to Kṛṣṇa consciousness and become eternally happy.
(Srimad Bhagavatam----7:7:45----purport).

"Only a rare person who has adopted complete, unalloyed devotional service to Kṛṣṇa can uproot the weeds of sinful actions with no possibility that they will revive. He can do this simply by discharging devotional service, just as the sun can immediately dissipate fog by its rays." The real purpose of human life is to attain liberation from material entanglement. Such liberation may be achieved by many methods (tapasā brahmacaryeṇa śamena ca damena ca (S.B.6:1:13), but all of them more or less depend on tapasya, austerity, which begins with celibacy. Śukadeva Gosvāmī says that those who are vāsudeva-parāyaṇa, who have fully surrendered to the lotus feet of Lord Vāsudeva, Kṛṣṇa, automatically achieve the results of mauna (silence), vrata (vows) and other such methods simply by discharging devotional service. In other words, these methods are not so powerful. If one takes to devotional service, all of them are very easily performed.
(Srimad Bhagavatam----7:9:46----purport).

Everyone should become a devotee of the Lord, because by becoming a devotee of the Lord one automatically acquires the other qualities.
yasyāsti bhaktir bhagavaty akiñcanā
sarvair guṇais tatra samāsate surāḥ
harāv abhaktasya kuto mahad-guṇā
manorathenāsati dhāvato bahiḥ
"In one who has unflinching devotional service to Kṛṣṇa, all the good qualities of Kṛṣṇa and the demigods are consistently manifest. However, he who has no devotion to the Supreme Personality of Godhead has no good qualifications because he is engaged by mental concoction in material existence, which is the external feature of the Lord." (S.B.5:18:12) Our Kṛṣṇa consciousness movement, therefore, is all-embracing. Human civilization should take it very seriously and practice its principles for the peace of the world.
(Srimad Bhagavatam----7:11:8-12----purport).

"Only a rare person who has adopted complete, unalloyed devotional service to Kṛṣṇa can uproot the weeds of sinful actions with no possibility that they will revive. He can do this simply by discharging devotional service, just as the sun can immediately dissipate fog by its rays." (S.B.6:1:15) If one is under the protection of a devotee and sincerely renders service unto him, by this process of bhakti-yoga one is certainly able to counteract all sinful reactions.
(Srimad Bhagavatam----9:9:6----purport).

Nonetheless, He steals butter like one who is poverty-stricken. Yamarāja, the controller of all living entities, fears the order of Kṛṣṇa, yet Kṛṣṇa is afraid of His mother's stick. These contradictions cannot be understood by one who is not a devotee, but a devotee can understand how powerful is unalloyed devotional service to Kṛṣṇa; it is so powerful that Kṛṣṇa can be controlled by an unalloyed devotee. This bhṛtya-vaśyatā does not mean that He is under the control of the servant; rather, He is under the control of the servant's pure love. In Bhagavad-gītā (1.21) it is said that Kṛṣṇa became the chariot driver of Arjuna. Arjuna ordered Him, senayor ubhayor madhye rathaṁ sthāpaya me 'cyuta: "My dear Kṛṣṇa, You have agreed to be my charioteer and to execute my orders. Place my chariot between the two armies of soldiers." Kṛṣṇa immediately executed this order, and therefore one may argue that Kṛṣṇa also is not independent.
(Srimad Bhagavatam----10:9:19----purport).

Advaita Ācārya was a contemporary of Lord Caitanya's father. He felt sorry for the condition of the world because even after Lord Kṛṣṇa's appearance, no one had interest in devotional service to Kṛṣṇa. This forgetfulness was so overwhelming that Advaita Prabhu was convinced that no one but Lord Kṛṣṇa Himself could enlighten people about devotional service to the Supreme Lord. Therefore Advaita requested Lord Kṛṣṇa to appear as Lord Caitanya. Offering tulasī leaves and Ganges water, He cried for the Lord's appearance. The Lord, being satisfied by His pure devotees, descends to satisfy them. As such, being pleased by Advaita Ācārya, Lord Caitanya appeared.
(Sri Caitanya Caritamrta----1:3---summary).