You need to be alert and honest to find out, for example, whether your sense of self-worth is bound up with things you possess. Do certain things induce a subtle feeling of importance or superiority? Does the lack of them make you feel inferior to others who have more than you? Do you casually mention things you own or show them off to increase your sense of worth in someone else's eyes and through them in your own? ...

Eckhart Tolle

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