唯一不变的就是变化本身，这是自然界一个永恒的主题。
Everything changes except the law of change.
Illustrations should not just decorate the text; they should expand it.
Fear of things invisible is the natural seed of that which every one in himself calleth religion.
人性的弱点总是充满贪婪、恐惧或者是愚蠢，这是完全可以预测的，但是我们无法预测这种人性弱点的发生顺序。