This is because this process helps eliminate much of the uncertainty from our lives. It is well documented that uncertainty creates stress. Have you ever stopped to think about how orderly the world is. Every day is 24 hours. It takes exactly the same amount of time for the Earth to revolve around the Sun.
Gravity is always consistent.
The molecular weight of atoms remains the same. God created a very orderly world. We as humans would all go crazy if nothing was consistent from day to day. What if one day was 24 hours and the next was 36 hours and the next 20 hours - you get the point. The reason so many of us feel stressed out and nervous, and we get angry etc every day is because we have not created order in our individual lives.