He who is not happy with little will never be happy with much.
You are a little soul carrying around a corpse.
What is yours is to play the assigned part well. But to choose it belongs to someone else
Try not to react merely in the moment. Pull back from the situation. Take a wider view. Compose yourself.
If virtue promises happiness, prosperity and peace, then progress in virtue is progress in each of these for to whatever point the perfection of anything brings us, progress is always an approach toward it.
The wise realize that some things are within their control, and most things are not. They learn early on to distinguish between what they can and can't regulate.