The best and most beautiful things in the world cannot be seen or even touched - they must be felt with the heart.
世界上最好和最美丽的东西是看不见甚至摸不到的——它们必须用心去感受。
The art of invention consists in finding out the causes of known effects.
The historian must have some kinship with his subject. The dead will not speak unless they are properly addressed.