He said that he was only good for having power, but not weilding powers, since he was too arrogant and ambitious for weilding power.
That was also why he understood Tom Riddle so easily - Riddle was the ambitions, power hungry side of Dumbledore, and he also saw the end result of what happens when you don't trust others, let your ambitions and lust for power superscede your desire to weild that ambition responsibly, and allow the power to corrupt you abolutely.
Oh, good idea!
(Agree with you on the chamber pots. EEEEW.)