If it doesn't challenge you, it won't change you.
生存下来的不是最强壮的物种,也不是最聪明的物种,而是对变化反应最迅速的物种。
唯一真正的监狱是恐惧,唯一真正的自由是从恐惧中解脱。
记忆是我们随身携带的日记。
The difference between a dream and a goal is action.
In mathematics, the journey of discovery is as important as the destination.