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THE SCIENCE OF SELF-REALIZATION
association means to play with Kṛṣṇa, to dance with and love Kṛṣṇa. Or Kṛṣṇa can become your child—whatever you like.
There are five primary relationships with Kṛṣṇa: as a passive devotee, as a servant, as a friend, as a parent, and as a lover. The cows in Kṛṣṇa's abode are also liberated souls. They are called  surabhi  cows. There are many popular pictures showing how Kṛṣṇa loves the cows, how He embraces and kisses them. That passive relationship with Kṛṣṇa is called  śānta . Their perfect happiness is achieved when Kṛṣṇa comes and simply touches them.
Other devotees are inclined to actually give service. They think, "Kṛṣṇa wants to sit down. I will arrange a place for Him. Kṛṣṇa wants to eat. I will get Him some nice food." And they actually make these arrangements. Other devotees play with Kṛṣṇa as friends on equal terms. They do not know that Kṛṣṇa is God; to them, Kṛṣṇa is their lovable friend, and they cannot forget Him for a moment. All day and all night, they think of Kṛṣṇa. At night, when they are sleeping they think, "Oh, in the morning I shall go and play with Kṛṣṇa." And in the morning they go to Kṛṣṇa's house and stand by while Kṛṣṇa is decorated by His mother before going out to play with His friends in the fields. There is no other activity in Kṛṣṇaloka (Kṛṣṇa's abode). There is no industry, no rushing to the office, or any such nonsense. There is sufficient milk and butter, and everyone eats plentifully. Kṛṣṇa is very fond of His friends, and sometimes He enjoys stealing butter for them. One can actually live this way, and that is the perfection of existence. We should hanker for that perfectional stage of life. Kṛṣṇa consciousness is the process to attain it.
But as long as one has even a slight attachment for this material world, one has to remain here. Kṛṣṇa is very strict. He does not allow anyone to enter into His association who has any tinge of the material conception of life.  Bhakti  must be free from material contamination. Do not think, "I am a very learned scholar. I shall find out what is the Absolute Truth by mental speculation." That is nonsense; one can go on and on speculating and will never find the source of all sources. It is said in the  Brahma-saṁhitā , "One can go on speculating about the Absolute Truth for millions and millions of years, and still it will not be revealed." One can rot in this material world as he is and can go on speculating, but that is not the right process. Here is the process— bhakti-yoga .
Lord Caitanya says that to render devotional service to Kṛṣṇa is the highest perfectional stage of life, and compared to this, other things for which people are hankering in this material world are like bubbles in the ocean. Generally, people are after rewards, and therefore they become