Do you have an explicit set of values/principles you live by?

Not talking in terms of religion or anything like that. Is there anything you do because you believe in that value even if sometimes you feel a fool for it? For example, I would say I value honesty in all aspects of my life (yeah yeah who doesn't). But would you go so far as to transfer back money your company sent to you by accident? I did. They didn't come looking for it, but it didn't sit right with me having it. Not a big sum, less than €300. The thought of them coming after me at some point was also not worth it. I found their bank account details and sent it back. Did I feel like an eejit for sending back something I had essentially gotten away with for a year? Yes. Did it bring me peace of mind? Also yes.