There is nothing so practical as a good theory.

The American culture ideal of the "self-made-man," of everyone "standing on his own feet" seemed as tragic a picture as the initiative-destroying dependence on a benevolent despot. He felt and perceived clearly that we all need continuous help from each other, and that this type of interdependence is the greatest challenge to maturity of individual and group functioning.

When we are young we are like a flowing river - and then we freeze.

If you want truly to understand something, try to change it.

Every psychological event depends upon the state of the person and at the same time on the environment, although their relative importance is different in different cases

A successful individual typically sets his next goal somewhat, but not too much, above his last achievement.

Experience alone does not create knowledge.