A good thing does not only mean how does it make you feel good, also include other goods things it causes. A bad thing does not only mean how does it make you feel bad, also include other bag things it causes.
For example, when a good incident happens to you, you feel happy and have higher motivation to do other things. It would cause success to other things.
If a bad incident happens to you. You feel unhappy and lose motivation to do other things. It would cause loss to other things.