You Can’t Please Your Enemies (So Don’t Try)
Even though he's not completely Thomistic in his treatment of the virtues, C.S. Lewis brilliantly explains in chapter 2 of Mere Christianity the difference between vanity and pride: That is why vanity, though it is the sort of pride which shows most on the surface, is really the least bad and most pardonable sort. The vain person wants praise, applause, admiration, too much and is always angling for it. It is a fault, but a childlike and even (in an odd way) a humble fault. It shows that you are not yet completely contented with your own admiration. You value other people enough to want them to look at you. [...]