I need time to create. Time is the most precious thing.
古代著书立说的人,都是有所为而为之,不是随便写写的。
心理学概念的价值在于其生活应用。
Your work is going to fill a large part of your life, and the only way to be truly satisfied is to do what you believe is great work.
做数学的艺术在于找到那个包含所有普遍性萌芽的特殊案例。