Why is it so important to have a high-quality decision process?
Because there are only two things that determine how your life turns out: luck and the quality of your decisions. You have control over only one of these two things.
Luck, by definition, is out of your control. Where and when you were born, whether your boss comes into work in a bad mood, which admissions officer happens to see your college application—these are all things that are out of your hands.
What you do have some control over, what you can improve, is the quality of your decisions. And when you make better-quality decisions, you increase the chances that good things will happen to you.
-Annie Duke, from the Introduction to How to Decide: Simple Tools for Making Better Choices