Most of us are familiar with the scientifically accepted concept of the psychological ego: the materialistic ego that is a reservoir of instinctive impulses dominated by pleasure. This ego comes in contact with the external world via the senses and it is imbued with consciousness. This is the ego of acquired experience. The “ego ideal” is a standard of perfection that was formed in childhood through self-identification with persons who are admired. This is the “I Myself” that is expressed through this ego. In Kabbalah it is referred to as the Satan, The Other.
There is a wholly different side of the ego, which is the real spiritual Ego: the "God within”. If we believe that everything is connected through this Source of Life, then this Divine Ego serves as the connection back to the Universal Wholeness of which this Ego is a part of. This is not the psychological ego nor is it acquired by experiences. This Ego creates the experiences and has the power to manifest. This Ego, which helps to connect us to the Divine, goes by many names across belief systems: The Filament in the Tree of Life, The Christ within, The Light within us, the Holy Spirit, etc.
Within each of us are these two constantly engaging and opposing egos - the “I, Myself” ego that is attached to the results of experiences that pleasure the senses, and the “God within” Ego, that is connected to the Universal Wholeness. The God within Ego, while individually present within each of us, is a self-expression of the Divine. Anything that separates us from understanding that we are One with the Whole bars the Divine from Self-Expression through us. What we have left, then, is only the acquired ego, which is not enough to meet the issues of life creating a void within. This is why we practice our connection to the Divine, through mindfulness, meditation, yoga, and other activities. To maintain equilibrium balance of the yin with the yang, we must actively seek to engage with the ever-present God within.