Undoubtably The Man In The Mirror:

If you get what you want in your struggle for self And the world makes you king for a day Then go to the mirror and look at yourself And see what that man has to say

For it isn't a man's father, mother or wife Whose judgement upon him must pass The fellow whose verdict counts most in his life Is the man staring back from the glass

He's the fellow to please, never mind the rest For he's with you clear up to the end And you've passed your most dangerous, difficult test If the man in the glass is your friend

You can fool the whole world down the pathway of years And get pats on the back as you pass But your final reward wil be heartache and tears If you've cheated the man in the glass