数学中发现的快乐是无与伦比的。
The joy of discovery in mathematics is unparalleled.
The past is what you remember, imagine you remember, convince yourself you remember, or pretend you remember.
The more you deny something, the more attention it gets.
勇气是能站起来侃侃而谈。勇气也是能坐下来静静倾听。
我不害怕跌倒，因为我知道我会重新站起来。