享受出现在无聊和焦虑之间的边界，当挑战与个人的行动能力刚好平衡时。
Enjoyment appears at the boundary between boredom and anxiety, when the challenges are just balanced with the person’s capacity to act.
To be a good mathematician, you need to have both intuition and rigor.
我认为不断挑战自己，不要让自己太舒服是很重要的。