Rāja-vidyā: The King of Knowledge
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Knowledge in Kṛṣṇa consciousness is so perfect that if one performs work in Kṛṣṇa consciousness and yet does not attain perfection, in his next life he takes up from wherever he left off. In other words, actions performed in Kṛṣṇa consciousness are durable. On the other hand, material achievements, because they pertain to the body, are vanquished at death. Knowledge that pertains to designations does not endure. I am thinking that I am a man or a woman, an American or Indian, a Christian or Hindu—these are all designations pertaining to the body, and when the body is finished, they will also be finished. We are actually spirit, and therefore our spiritual activities will go with us wherever we go.
Śrī Kṛṣṇa indicates that this king of knowledge is also happily performed. We can easily see that activities in Kṛṣṇa consciousness are joyfully done. There is chanting and dancing, eating  prasādam  (food that has been offered to Kṛṣṇa) and discussing  Bhagavad-gītā . These are the main processes. There are no stringent rules and regulations that we have to sit so straight for so long or do so many gymnastics, or control our breath. No, the process is very easily and happily done. Everyone wants to dance, to sing, to eat and to hear the truth. This process is truly  susukham —very happy.
In the material world there are so many gradations of education. Some people never finish grammar school or high school, whereas others go on and receive a university education, a BA, MA, PhD, and so on. But what is this  rāja-vidyā , the king of education, the  summum bonum  of knowledge? It is this