“The more limited, the more narrowly ego your view of yourself is, the more you will see, focus on, and react to the ego limitations, the unconscious in others. Their “faults” or what you perceive as their faults become to you their identity. This means you will see only the ego in them and thus strengthen the ego in yourself.” Eckhart Tolle (from The Power of Now)
Imagine your consciousness is a flashlight selecting this and that to be conscious of. The beam of light you use to see others is the same beam by which you see yourself.