"The past is a foreign country; they do things differently there."
所以，天地不夸耀自己的明亮，大水不夸耀自己的清澈，大火不夸耀自己的炎烈，有德之君不夸耀自己德行的高远，这样才能做众人的领袖。
"In computational learning theory, the challenge is not just to learn, but to understand how learning is possible."