Altruism v. Philanthropy

In my research I come across the words altruism and philanthropy quite a bit. Until recently I hadn't given much thought to these words, assuming they were essentially perfect substitutes. Not that this post is particularly eye-opening or profound, but upon looking the terms up it becomes pretty apparent that altruism, or altruistic behavior is a stronger proposition than philanthropic behavior.

altruism - unselfish regard for or devotion to the welfare of others.

philanthropy - goodwill to fellowmen ; especially : active effort to promote human welfare.

In other words, while both are concerned with welfare, one can act in a philanthropic manner as motivated through selfishness, whereas altruism inherently precludes such behavior. Just something to think about the next time you hear someone being lauded as a philanthropist. Money is good, but motives are important...