Psychology must be based on observable phenomena, not abstractions.

我不是圣人，我是罪人。

我相信音乐有治愈和团结人心的力量。

It is love, not reason, that is stronger than death.

The best way to learn mathematics is to do mathematics.

The preservation of the means of knowledge among the lowest ranks is of more importance to the public than all the property of all the rich men in the country.