A proof of a proposition is a process the nature of which is such as to produce in us a belief in that proposition.
Time does not move in a straight line; it folds back on itself.
人生最大的荣耀不在于从不跌倒,而在于每次跌倒后都能站起来。
The longer I live the more I see that I am never wrong about anything, and that all the pains I have so humbly taken to verify my notions have only wasted my time.
最重要的是享受生活——快乐——这才是最重要的。