These are the simple facts of revelation (and we can follow their logic, as well as their tragedy and wonder):
What the Bible calls sin is, in one phrase, independent self. The created self was made to contain and express the Creator Self who is selfless love.
Instead, in the person of Lucifer, probably the created being nearest to God Himself, a new and horrible form of life came into existence: a created self who refused to contain the selfless Self of God but chose to live for and by himself. Lucifer was the sin-spirit, the spirit of self-love, self-seeking, and all the sins known to man that proceed from that.
The history of the creation of man in the Garden of Eden tells us what happened to our forefather. He was created to contain God in a living union, which was symbolized for him in the offer of “the tree of life in the midst of the garden.”
But as a human being with free choice, he could take another way—the way of self-love: symbolized for him in the other tree in the midst of the garden—the tree of the knowledge of good and evil.
Deceived by the lying spirit of Satan, he received into himself the spirit of error rather than the Spirit of truth, and became a child of the Devil. Since then the whole human race is born with the spirit of self-centeredness in it. The Bible calls it “the spirit that now worketh in the children of disobedience.”
That we are all born and live under that domination is obvious, for we are all by nature egoists and self-lovers. Every breath we breathe, therefore, is sin—because anything less than God’s perfection is sin, and God’s perfection is perfect love. But such total love to God and our brother is totally impossible without God who is love living in us.
Excerpt taken from The Key To Everything by Norman Grubb