1. Money and Material Goods Do Not Create Happiness
This is an old saying that is true TO A POINT. It's often used as a replacement for "be happy with that you have" which is a bunch of bull****. What this saying REALLY means is that after you get to a comfortable level of food, clothing, entertainment, living arrangement, and other necessities, you get far less happiness per additional dollar earned. The original study out of Princeton University came out in 2010 stating that once you make $75K, you don't get much happier making more. That number adjusted for today is pretty close to $100K.
The point in saying all this is that if you are looking to be happy with your money, you don't need to break your back and work overtime in order to make $120K next year. You'll feel like you wasted time more than your happiness increased.