The most exciting discoveries are those that challenge our assumptions.

试管婴儿的研究是出于帮助不孕夫妇的愿望。

In mathematics, you don't understand things. You just get used to them.

I believe in second chances because I know what it's like to mess up.

Quality is not an end in itself; it is a means to an end.

The human figure is the most important thing to me.

The aim of education should be to teach us rather how to think, than what to think—rather to improve our minds, so as to enable us to think for ourselves, than to load the memory with thoughts of other men.

The study of the mind must be strictly empirical.