So jñāna-karmādy-anāvṛtam, ānukūlyena kṛṣṇānuśīlanam (CC Madhya 19.167). Anuśīlanam, culture of Kṛṣṇa favorably, that Kṛṣṇa, how Kṛṣṇa is pleased, we should do like that. We should know how Kṛṣṇa is pleased. How you can know? The Bhagavad-gītā is there, and take the right interpretation from a right person. Then you'll know what Kṛṣṇa wants and do accordingly. Ānukūlyena kṛṣṇānuśīlanaṁ bhaktir uttamā. Then you are elevated to the first-class devotional service. You see? First-class devotional service. Everything should be anukūla. Anukūla means favorable.
So these things are there. It is a great science, and we have got immense literature for this. If we have got time, we can utilize. We can understand this science and prepare ourself for the supreme benefit.