People can be divided into these types: strangers, acquaintances, familiar people, friends, and close friends. True friendship isn't about compliments to your face, but whether you're mentioned when they talk about friends behind your back.
你唯一的限制就是你相信的限制。
The iron rule of nature is: you get what you reward for. If you want ants to come, you put sugar on the floor.
The beauty of chemistry lies in its ability to explain the unseen.