Life: the spiritual state of union with God.
Death: the spiritual state of being separated from God.
Inside of God is the sustaining power—life; outside only withering death.
The first spiritually alive man and woman (Adam and Eve) were created in God’s own image and likeness. Our Savior told us, “I tell you the truth, anyone who will not receive the kingdom of God like a little child will never enter it,” and they had innocent child-like faith in their spiritual Father, so they lived in total peace in the kingdom of God.
The Tempter came and put the idea in their minds that they were not children, that they did not need God to hold their hands, as it were, that if they took from the tree of the knowledge of good and evil they would be like God knowing what to do and could work with God rather than under him. In a way, the Temper challenged them to grow up and be adults. This idea tickled their pride, and their sense of inner pride encouraged them to go forth, and in so doing, they broke the faith-bond that they had had with the Creator. (Friend, God is not self-serving. Any instruction that he gives to you is given out of love for you. God is the only one that is good enough not to be tempted by self-interest.)
The Scriptures tell us that union with God is very much like a marriage. When you enter into a proper marriage, you are, in a sense giving yourself to your partner and receiving them back in return. The two of you become one. A husband’s interest should be for the benefit of his wife, and a wife’s interest should be for her the benefit of her husband. Self-interest within marriage is always wrong. When you break away from God, you are, in a sense divorcing him. Adam and Eve were one with God, and then they considered themselves, that is, their interest, so having acted on that they proved themselves unfaithful in their relationship with God, and the union was broken, making them two, that is, God and them.
No one separated from God is alive. God is the author and sustainer of life. Mankind, having been given two lives now has one, and if you die without a faith-bond to God, then you have died what the Bible calls the second death. If you die the second death, then you will remain dead forever, that is separated from God the Sustainer.