An arrogant person considers himself perfect. This is the chief harm of arrogance. It interferes with a person's main task in life—becoming a better person.
A man can spend several hours sitting cross-legged in the same position if he knows that noting prevents him from changing it; but if he knows that he has to sit with his legs crossed like that, he will get cramps, his legs will twitch and strain towards where he would like to stretch them.