The most innovative solutions often come from constraints.

农民最好的工具是他的头脑。

Man is not logical and his intellectual history is a record of mental reserves and compromises. He hangs on to what he can in his old beliefs even when he is compelled to surrender their logical basis.

唱歌的人不求声音高尖而求合乎节拍，评论者不追求华丽的辞藻而注重所谈论的事情符合实际。