The days are long but the decades are short | Sam Altman 

2) Life is not a dress rehearsal—this is probably it.  Make it count.  Time is extremely limited and goes by fast.  Do what makes you happy and fulfilled—few people get remembered hundreds of years after they die anyway.  Don’t do stuff that doesn’t make you happy (this happens most often when other people want you to do something).  Don’t spend time trying to maintain relationships with people you don’t like, and cut negative people out of your life.  Negativity is really bad.  Don’t let yourself make excuses for not doing the things you want to do.

9) Have clear goals for yourself every day, every year, and every decade. 

15) Don’t worry so much.  Things in life are rarely as risky as they seem.  Most people are too risk-averse, and so most advice is biased too much towards conservative paths.

16) Ask for what you want.