乐观是一种工具，你可以用它来实现你为自己设定的目标。

The writer is the enemy of all dictatorships, whether of the left or of the right.

The best way to predict the future is to create it.

——〈在广州岭南学堂的演说〉，1912年5月7日

I believe that the testing of the student's achievements in order to see if he meets some criterion held by the teacher, is directly contrary to the implications of therapy for significant learning.