成为英雄的最大障碍是怀疑自己是否会证明自己是个傻瓜；真正的英雄主义是抵制这种怀疑；最深刻的智慧是知道何时应该抵制它，何时应该服从它。

The best teacher is the one who suggests rather than dogmatizes, and inspires his listener with the wish to teach himself.

学习的最好方法是通过实践和犯错。