There is nothing that strengthens the ego more than being right. Being right is identification with a mental position—a perspective, an opinion, a judgment, a story. For you to be right, of course, you need someone else to be wrong, and so the ego loves to make wrong in order to be right. In other words: You need to make others wrong in order to get a stronger sense of who you are.

Eckhart Tolle

from A New Earth: Awakening to Your Life's Purpose