The ability to associate depends, in turn, on the degree to which communities share norms and values and are able to subordinate individual interests to those of larger groups.

Nothing can stop the man with the right mental attitude from achieving his goal; nothing on earth can help the man with the wrong mental attitude.

真正的奢华在于细节——手工缝制的接缝，精心挑选的木纹。

数学家是能在定理之间找到类比的人；更好的数学家是能在证明之间看到类比的人；而最好的数学家是能注意到理论之间类比的人。