Generally speaking, envy, resentment, and self-pity are disastrous modes of thoughts.Self-pity gets fairly close to paranoia, and paranoia is one of the very hardest things to reverse.
To do mathematics is to engage in a dialogue with the universe, seeking answers to questions we may not even know how to ask yet.
唯一的限制是你给自己设定的限制。
你必须有一个梦想,这样你才能在早上起床。
You have to be willing to fail to be successful.