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The most important thing in science is not so much to obtain new facts as to discover new ways of thinking about them.

心理學家必須是一個嚴格的實證主義者。

唯一的失敗就是不去嘗試。

The actions of men are the best interpreters of their thoughts.

有時候問題很復雜，但答案卻很簡單。

The circumstances of the world are continually changing, and the opinions of man change also; and as government is for the living, and not for the dead, it is the living only that has any right in it.

心理學唯一有效的數據是受過訓練的觀察者的報告。