What exactly is the ego?
The ego is that very thing which limits us in every sphere of life. We are God's children; we are one with God. But the ego makes us feel that we do not belong to God, that we are perfect strangers to Him. At best, it makes us feel that we are going to God, not that we are in God.The ordinary human ego gives us a sense of separate identity, separate consciousness. No doubt, a sense of individuality and self-importance is necessary at a certain stage in man's development. But the ego separates our individual consciousness from the Universal Consciousness. The very function of the ego is separation. It cannot feel satisfaction in viewing two things at a time on the same level. It always feels that one must be superior to the other. So the ego makes us feel that we are all separate weaklings, that it will never be possible for us to be or to have the infinite Consciousness. The ego, finally, is limitation. This limitation is ignorance, and ignorance is death. So ego ultimately ends in death.
Sri Chinmoy, Yoga and the spiritual life. The journey of India's Soul., Tower Publications, Inc., New York, 1971