C.S. Lewis, described as the "apostle to the skeptic," once wrote that when errors come into the world they come in pairs, as men are driven to one extreme or another.  If you stop and think about it, you will probably agree with the brilliant former professor of Medieval English.  Think of yourself more highly than you ought to and we say you are stuck on yourself–full of pride and arrogant.. On the other hand, if you constantly belittle yourself, your self‑image crumbles and you slide into debilitating depression.