4 Krṣṇa Consciousness: the Topmost Yoga System
parent; Sudāmā is His lover as a friend; Arjuna also as a friend—there are millions and billions of different kinds of direct devotees of Krṣṇa.
So the  yoga  systems as described here lead to  bhakti-yoga , and  bhakti-yoga  can be practiced by persons who have developed attachment to Krṣṇa. Others cannot practice it. And, if anyone is able to develop that attachment, the relationship will be that he will understand God, Krṣṇa, perfectly. However we may try to understand God by our different theories or speculations, it is still a difficult job. We may say that we have understood God, but it is not possible to understand Him as He is, because we have limited senses, and He is unlimited.
It is said in the  Śrīmad-Bhāgavatam  that our senses are imperfect, all of them. We cannot understand even the material world perfectly. You have seen so many planets and stars in the sky at night, but you do not know what they are. You do not even know what the moon planet is, though men have been trying for so many years to go there in sputniks. Even this one planet, Earth! We do not know what varieties there are even on this planet! If you go to the sea, to the sky, your perception is limited. Our knowledge is, therefore, always imperfect. On that we must agree. If we foolishly think that we have acquired all forms of knowledge and we have advanced in science, this is another foolishness. It is not possible.
And, when it is not possible to understand even the material things which we daily see with our eyes, what can we say of the spiritual world and Krṣṇa, the Supreme Personality of Godhead? He is the supreme spiritual form, and it is not possible to understand Him by our limited senses. Then why are we bothering so much for Krṣṇa consciousness, if it is not possible? If these imperfect senses cannot realize Krṣṇa as He is? The answer is that if you become submissive, if you develop the spiritual attitude of following Krṣṇa, and you are as a servant or a friend, as a parent or as a lover—if you begin to give