Worry is evidence of an ill-controlled brain; it is merely a stupid waste of time in unpleasantness.
Well, my deliberate opinion is - it's a jolly strange world.
You are not in charge of the universe; you are in charge of yourself.
Always behave as if nothing had happened, no matter what has happened.
Any change, even a change for the better, is always accompanied by drawbacks and discomforts.
We need a sense of the value of time - that is, of the best way to divide one's time into one's various activities.