According to scientist/theologian Emanuel Swedenborg, all angels and devils come from the human race. They are all created finite beings and get their life from the One Infinite God of heaven and earth.
Compared to God, all humans are flawed in heart and mind. However, even in the process of spiritual salvation, evil is never taken away from any individual. But with angels, these various imperfections and their compulsions are mercifully withheld by the Lord and placed at the circumference of their lives. For devils, these negative traits remain at the center of their lives as centers of initiative.
Devils use their evil intentions for deception. Angels use their evils for humility.
The worst worldview for a person to embrace is to believe—constitutionally—that life and goodness emanates from himself—or herself. Therefore, genuine spiritual enlightenment cannot occur without some rude awakening and “balloon-popping.”
Our individual sense of “selfhood” (proprium) was a gift by the Lord God, in order that we could each be kept in freedom to make life choices. Therefore, this sense of self is a necessary illusion. And those who choose to become God’s angels and live eternally in heaven can perceive firsthand just how the Creator fills their souls with life force and love.
(That is why doing the Lord’s Will is the true path towards obtaining individuality. God knows our true destiny, but we choose our ultimate fate.)
Skeptics in the other world are sometimes allowed to experience what happens when God removes His Divine influence for just a moment—causing those very individuals to immediately collapse. They are revived as soon as this Divine influence returns.
This notion of “living in an illusion” is not easily embraced in today’s human society. But human self-importance (egoism) is why so many things are running amuck in all human affairs.