Fretting is all time wasted on the road.
About two things we should never fret, that which we cannot help, and that which we can help.

Better find one of your own faults than ten of your neighbor's.
It is not the troubles of to-day, but those of to-morrow and next week and next year, that whiten our heads and wrinkle our faces.
"Every man we meet looks as if he'd gone out to borrow trouble, with plenty of it on hand," said a French lady driving in New York.
The pendulum of a certain clock began to calculate how often it would have to swing backward and forward in the week and in the month to come; then looking further into the future, it made a calculation for a year, etc.

The pendulum got frightened and stopped.

Do one day's work at a time.

Do not worry about the trouble of to-morrow.