没有人值得你流泪,值得让你这么做的人不会让你哭泣。
真正的智能是理解,而不仅仅是计算。
The only source of knowledge is experience.
One ought never to turn one's back on a threatened danger and try to run away from it. If you do that, you will double the danger. But if you meet it promptly and without flinching, you will reduce the danger by half.