I accept all that I cannot change.

Acceptance gets confused with approval, and they are not the same transaction. You can find something completely unacceptable and still stop arguing with the fact of it.

Anyone who has stood in front of a departure board knows the difference. The train is cancelled. Your feelings about this are entirely valid and have no effect whatsoever on rolling stock.

At some point you either sit down or you keep standing there being right.

The energy released by stopping is not small. Usually it is the exact energy needed for the part you can actually affect.