事理明白则心愈能清楚而专一，心能专一则事理愈能通达流畅。
Your time is limited, so don't waste it living someone else's life.
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.