"The most valuable thing you will ever own is your time. Spend it wisely."

This is one of the most important lessons to learn. Time is an asset that you only have so much of. Don't waste your it on other peoples bullshit. Use your time to do the things you enjoy and to do things that will help you. I'm not saying you can't help a friend out,but be reasonable about your time. Don't let someone else completely dictate it.

(On mobile again,so I'll add flair when I get home)