The ego serves us as the instrument that allows us to relate to the outside world. When the ego is pure it is a blessing, it is the Divine itself. When the impure ego dominates our experience, our life becomes a self-centered, exterior-oriented experience that separates us from our true Self. Then it becomes the creator of delusion and suffering.
Spirituality is not about destroying the ego, but transforming it. It is the impure ego that forces us to live in the experience, I am my body, I am my thoughts, I am my emotions, I am a sinner and worthless, I am a separate individual. The transformation is to redirect the ego from false identifications to true identification, I am the Self, I am pure consciousness, I am God, I am one with everything, I am bliss, I am Brahman.
While understanding this is helpful because understanding is half of the transformation, the other half of the transformation relies upon experience. We complete our transformation by shifting out of the state of misplaced identification. This requires that our state, our awareness, our experience, includes the Self. Then the ego no longer holds the power to identify us with the physical, mental or emotional bodies; the physical body, the subtle body or the causal body.
It is false identification that creates our suffering. When we identify with the physical body we become the ongoing entropy of disease, pain and old age. When we identify with the casual body, our thoughts are consumed with jealousy, lust, greed, pride anger and delusion. When we identify with the subtle body our impressions from countless lifetimes haunt us. When we identify with the Self, with consciousness, presence, awareness, God, then suffering ends. Then we become the witness to the activities of our other bodies.