Be realistic, demand the impossible!

解释：看到兔子再回头唤猎狗，还不算太晚；跑掉了羊再去修补羊圈，也不算太迟。

The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.

The freedom then of man, and liberty of acting according to his own will, is grounded on his having reason, which is able to instruct him in that law he is to govern himself by, and make him know how far he is left to the freedom of his own will.

Learning consists in the modification of certain mediating processes which operate between the stimulus and the response.

最大的胜利来自最艰难的战斗之后。

我不是完美主义者，但我喜欢把事情做好。