I used to get tired by the same thing all the time, Carlos.
I'd get just as upset as you, too, if not moreso.
I just changed my angle. I do whatever I can whenever I can for anyone I can. I just do it because I can and don't want or expect anything in return. I consider it a gift.
That way, no matter what happens, I'm not going to get upset.
I'm rewarded every day by the help of others, and the Grace of God.
Turns out I'm WAY ahead of the game, and I need to give a lot more back.
So I just keep on trying.
