Freedom is man's capacity to take a hand in his own development. It is our capacity to mold ourselves.

Fear is the main source of superstition， and one of the main sources of cruelty. To conquer fear is the beginning of wisdom， in the pursuit of truth as in the endeavour after a worthy manner of life.

心理活动是有机体与其环境的对话。

The only existence we conceive is the existence of sensible things.

当目标是取得有意义的进展时，合作胜过竞争。