Ego is no more than this: identification with form, which primarily means thought forms. If evil has any reality--and it has a relative, not an absolute, reality--this is also its definition: complete identification with form--physical forms, thought forms, emotional forms. This results in a total unawareness of my connectedness with the whole, my intrinsic oneness with every "other" as well as with the Source. This forgetfulness is original sin, suffering, delusion. When this delusion of utter separateness underlies and governs whatever I think, say, and do, what kind of world do I create? To find the answer to this, observe how humans relate to each other, read a history book, or watch the news on television tonight. (p. 22)
You might also like: An Excerpt from A New Earth by Eckhart Tolle