So it is with thought. We have a thought and then we say, "I have forgotten." Yes, the mind has forgotten, but the thought is not dead. It is going on; it never ends. Is there anything that ends? Nothing. Such words as "beginning" and "end" are our conceptions, and the further we go in studying life the higher the realization we get of those conceptions. It is this principle which is called unlearning. People are proud and satisfied with what they have learned, but the further one goes the more one finds that learning ends in unlearning.