There is no man, however wise, who has not at some period of his youth said things, or lived in a way the consciousness of which is so unpleasant to him in later life that he would gladly, if he could, expunge it from his memory.

Neither power nor wealth, only the scepters of art endure.

心理学必须是一门功能的科学，而不仅仅是事实的科学。

大自然似乎有意通过电现象向我们揭示物质的一种新的、迄今为止隐藏的特性。