每个人都有不为世人所知的秘密悲伤;很多时候,我们称一个人冷漠,而他只是悲伤。
What is necessary to change a person is to change his awareness of himself.
The mind grows by exercise, not by passive absorption.
You don't know what's in store, but you know what you're here for.
The fight against viruses is a continuous battle, and science must always stay ahead.