外表不端正，是因为没有培养好德行；内心不精诚，是因为没有修治好心灵；端正外表、修养德性，才能了解万物。

不要以虚妄的心伤害自己的本心，不要因外在的因素伤害了自身。

Every discovery opens the door to a thousand new questions.

The study of mathematics is like air or gravity—it is everywhere, and you can't see it, but you know it's there.