没有剑的契约只是空话，根本无法保护一个人。

艺术品的脆弱性常常是其最大的力量。

Do not think it worthwhile to produce belief by concealing evidence, for the evidence is sure to come to light.

不用圆规和曲尺，就不能画出方形和圆形。比喻做事要遵循一定的法则。

If a man will begin with certainties， he shall end in doubts； but if he will be content to begin with doubts， he shall end in certainties.

最少的材料，最大的效果。