Reaching Life's Perfection
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Lord Caitanya, however, speaks of favorably engaging all the senses in the service of Kṛṣṇa in pure devotional life. One should favorably engage one's senses and should do whatever Kṛṣṇa wants. Yet even if one engages one's senses against the will of Kṛṣṇa but still thinks of Kṛṣṇa, that is also advantageous. The demon Pūtanā, for example, thought of killing Kṛṣṇa. Just as the occupation of godly persons is to serve God, so the demons and atheists are always prepared to kill God. Pūtanā thought, "I shall kill Kṛṣṇa. He is only a child." This is another mistake of the demonic. They think Kṛṣṇa, or God, to be an ordinary child or man. So in this way Pūtanā was thinking: "Let me smear my breast with poison, and when the child goes to suck my milk, He will die." As we study this, we see that she approached Kṛṣṇa as His enemy, and yet He accepted her as a friend because He is so merciful. He did not take the demonic portion of her mentality, but He accepted her. Every living entity is conditioned, but Kṛṣṇa is not. A doctor or psychiatrist treats madmen, but he does not become mad. Sometimes a patient may become angry with him or call him ill names, but the doctor is sober and simply treats him. Similarly, if someone regards Kṛṣṇa as his enemy, Kṛṣṇa does not become his enemy.
Pūtanā came to poison Kṛṣṇa, but He took it otherwise. He thought, "I have sucked her breast milk. Therefore she has become My mother." Kṛṣṇa treated her as His mother, and therefore she became liberated to the same position as Kṛṣṇa's real mother, Yaśodā. The conclusion is that the highest perfection is to establish a favorable relationship with Kṛṣṇa, but even if one engages himself unfavorably, Kṛṣṇa is so merciful that He at least gives one salvation. All the enemies killed by Kṛṣṇa were immediately liberated.
Two classes of men may merge into the impersonal  brahmajyoti : he who is intentionally aspiring to merge into the impersonal  brahmajyoti  may enter, and those who are enemies of Kṛṣṇa and are killed by Him may also do so. Therefore, the devotee concludes, Why should I accept a condition which is offered even to God's enemies?
Caitanya Mahāprabhu recommends pure devotional service. There should be no desire to fulfill one's own material desires, there should be no attempt to understand Kṛṣṇa by experimental philosophy, and there should be no fruitive activities to derive material benefits from Kṛṣṇa. The only desire should be to serve Him favorably, as He desires. If Kṛṣṇa wants something, then we should do it. Suppose I were to ask a disciple, "My dear student, please give me a glass of water." It is then his duty to give me a glass of water. If he thinks, "Prabhupāda wants a glass of water,