The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all. And that, of course, causes great confusion.

我不想完美，我想真实。

社会结构的研究是对社会关系系统的研究。

解释：对事物最好的证明是有效果，对论点最好的认定是有证据。