Every physician, shoemaker, mechanic or educator must know his shortcomings if he is to do his work and make his living. For some decades, you have begun to play a governing role on this earth. It is on your thinking and your actions that the future of humanity depends. But your teachers and masters do not tell you how you really think and are; nobody dares to voice the one criticism of you which could make you capable of governing your own fate. You are "free" only in one sense: free from education in governing your life yourself, free from self-criticism.

Listen, Little Man! (1948)