My rules and guidelines for day-to-day life:
1) You can't argue with every idiot in the world, so why try?
2) If it seems too good to be true, it might be. What you need to do is exploit it while you can.
3) If you don't like it, or you don't believe in it, then don't do it.
4) If you put yourself in someone else's shoes, and you don't like it, help them get a better pair.
5) Don't dwell on mistakes. Fix them, move on, and don't make it again.
( I got this idea from Olympus player. If you like these, then you will LOVE hers. )