What's the best piece of advice you've ever received, and how has it influenced your life?

Treat the future you well. Especially for people who always procrastinate.

Like having a better time management so the future you won't have to worry about stuff. You finish things early so that the future you don't have to be anxious about deadlines. You think of the consequences of your actions before you act.

This also develops a positive feedback. When you are better off because what yourself have prepared beforehand, you thank you self. Then you are motivated to prepare more for your future self.