It would be hard to improve on Luther's description of fallen man as *homo in se incurvatus*, 'man curved in on himself'. Human fallenness is human selfishness. Most ambition is selfish ambition. People who 'succeed', because they attain wealth, fame or power, do so mainly because they are driven by an inner urge to self-aggrandizement. This is not pessimism, but the sober realism of Christians who want to look facts in the face.
--From "Life in Christ" (Eastbourne: Kingsway; Wheaton: Tyndale House, 1991), p. 86. Thanks John Stott.