"The science of psychology has been far more successful on the negative than on the positive side... It has revealed to us much about man's shortcoming...

One's only rival is one's own potentialities. One's only failure is failing to live up to one's own possibilities. In this sense, every man can be a king, and must therefore be treated like a king.
One's only rival is one's own potentialities. One's only failure is failing to live up to one's own ...
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