You can do what you will, but in any given moment of your life you can will only one definite thing and absolutely nothing other than that one thing.
Arthur SchopenhauerMan may have the most excellent judgment in all other matters, and yet go wrong in those which concern himself; because here the will comes in and deranges the intellect at once. Therefore let a man take counsel of a friend. A doctor can cure everyone but himself; if he falls ill, he sends for a colleague.
Arthur Schopenhauer