Quote Originally Posted by gregs656 View Post
Altruism is helping someone, at a cost to you, and gaining nor expecting anything in return.

I don't have trouble categorizing her behavior, she helped people because she enjoyed it and she would have been morally compromised if she hadn't.

If you can't find a behavior that fits, that doesn't mean there is a flaw in the definition.
Your leading me in circles. First you say it's impossible or nonexistant ("I'm not even sure it's possible to not gain in some way by helping someone else. Even if you don't intend to." and "no, I studied it and there just isn't much to prove it happens." and "There's not a great deal of evidence to suggests true altruism exists.").

Now you say Mother Teresa makes the grade so you must believe it's possible and does exist, which is where I came in.