To do evil a human being must first of all believe that what he's doing is good, or else that it's a well-considered act in conformity with natural law. Fortunately, it is in the nature of the human being to seek a justification for his actions.
Aleksandr SolzhenitsynThe belly is an ungrateful wretch, it never remembers past favors, it always wants more tomorrow.
Aleksandr Solzhenitsyn