The ratio of positive to negative emotions that predicts flourishing is about 3 to 1. Above that ratio, people tend to flourish; below it, they tend to languish.

能正确指出我缺点的人，是我的好老师；能赞成又能鞭策我的人，是我的好朋友；谄媚又阿谀奉承我的人，是害我的贼寇。

The more you know, the less you need.