I ask myself, “If I do this, will I still feel good about it tomorrow?” just by asking myself this one question alone , it will saves me a lot of trouble

This is a food for thought. We should always calculate what we do now, then check if you could be proud of that act by tomorrow.

The worst thing that will happen to someone isn't always FAILURE. It's simply REGRETS from past intentional or unintentional undoings. @favbae