Rādhārāṇī, the greatest devotee, the greatest lover of Kṛṣṇa. (break) Nanda-Yaśodā, the lover as parent. Sudāmā, a friend, lover as friend. Arjuna, lover as friend. Similarly, there are millions and trillions of different kinds of devotees of Kṛṣṇa. They are directly playing.
So this yoga system, as described herein, bhakti-yoga, it can be practiced by such persons who have developed such attachment for Kṛṣṇa. Others cannot. And if anyone is able to develop such attachment, then the result will be that he will understand God, or Kṛṣṇa, perfectly. However we may try to understand what is God by our different theories or speculation, it is a very difficult job to understand what is God. We may say that I have..., we have understood what is God, but it is not possible to understand God as He is, because we have got our limited senses and He is unlimited. How you can capture the Unlimited with your limited sense? But it is possible.