Do the right thing
It’s often difficult to assess what is “right”. Other times, it’s obvious. The difficulty in doing what we know to be right is that we may feel like we’re losing something, or perhaps won’t be rewarded. You might get away with not reimbursing someone for the loan they forgot about. You get no praise for averting catastrophe because there’s no catastrophe to show that your actions were warranted.
But YOU will know. And every little decision and action solidifies the person you are. Of course, we won’t always know what’s right. The question is: are you the kind of person who does the right thing when the answer is clear?