We Cannot Control Everything - Breathing Space Blog
Yes, for one thing your productive work life is finite. You will only be able to work for so many years at such and such a pace. One day that will no longer be possible. The big absolute, of course, is that life is finite and death is guaranteed, so far. If you are in your thirties, you have about 12,000 to 14,000 days and that's it.
Day to day, change is out of your control – it is guaranteed that how you used to do it or what worked yesterday will have less and less value with each passing day. You certainly want some stability in your life particularly in the areas of values and relationships, but don't fear change or close yourself off to it.