Knowledge means when we can understand that it is "my body," not "I body." Not this nonsense. Nobody says, "I body." Everyone says "my body." This is knowledge. But these rascals, these rascals of modern age, they are saying "I body." "I am this body." What you are? "I am this body." What is your interest? "Now anything which is interested with my body." He's not "I body," still he's interested with everything with this bodily relation. There are thousands of girls, women, but a particular woman with whom I have got my bodily relation, that is my wife. That is mine. And combination, the child comes out, "my child." In this way, "my house," "my property," "my body," "my relative," "my friend," "my brother," "my nation," my, my, my, my. But the rascal does not understand that the beginning of "my" philosophy has begun from this body, which I am not. This is knowledge. This is called brahma-jnana. If anyone understands the simple thing, that "I am not this body..."
Lecture on Bhagavad-gita 13.3, Paris, 11 August, 1973