While We're Amassing Quotations:

How about one from a random opening of a Thomas Merton book(one of my favorite games):

How to be a pharisee in politics: At every moment display righteous indignation over the means(whether good or evil) which your opponent has used to attain the same corrupt end which you are trying to achieve. Point to the means he is using as evidence that you own purposes are righteous- even though they are the same as his. If the means he makes use of are successful, then show that his success itself is proof that he has used corrupt methods. But in your own case, success is proof of righteousness.

-Thomas Merton, Conjectures of a Guilty Bystander