After achieving a certain level of professional success, you have to be careful it doesn't get into your head. Try not to develop an outsized ego. Remain humble and use your power and influence softly.
In looking for ways to tame my own ego over the years, I have benefited greatly from the unique insight of Eknath Easwaran, founder of Blue Mountain Center of Meditation. Let's hear him:
"A flat stomach is beautiful. For me, a flat ego is beautiful. A big ego has sharp angles and corners that stick out everywhere; we can't get near such a person without getting hurt. But when you have reduced the rough bulges of self-centeredness to the bare minimum," you can continue to be a leader that earns the respect and admiration of your colleagues.