This one, in particular, came to my mind today.
- Help others, especially if they ask you for help, whenever you can. Its easy and you'll feel good that you did.
- However, almost as importantly, never, ever expect anything in return - even thanks, certainly not praise or a returned favor. You'll very likely be disappointed and less likely to help the next time around.
So, if someone asks you for help, do it and enjoy the feeling it gives you. Just as importantly, discipline yourself to expect absolutely nothing in return.