不要为那些不愿在你身上花费时间的人而浪费你的时间。
Don‘t waste your time on a man/woman， who isn‘t willing to waste their time on you。
When you're young you think you're going to have lots of friends. But as you get older, you realize you can count them on one hand.
Singing is 90% listening. You have to listen to the silence too.