Also very important is the adage of Living below your means.
In simplicity your living expense should be less than your earnings.
At work, so many employees are telling me how they have no food in their house. Come on, they all earn just as much as I do with this minimum wage hike. And they have no food in their house. I have a mortgage and a family to care for and I still have food in the house. We all earn the same wage at our work place. Some people live a lavish lifestyle of fun and expense, yet have no food in the house.
Myself, if I miss one paycheck, I'm screwed. If I incur additional expenses, I'm screwed. Yes, I do live paycheck to paycheck.