When Satan tempted Adam and Eve to eat the fruit of the Tree of Knowledge of Good and Evil, he wanted them to believe that God was withholding what was rightfully theirs. He misled them into believing they were incomplete unless they become like God.
For God knows that in the day you eat of it your eyes will be opened, and you will be like God, knowing the difference between good and evil and blessing and calamity.
Genesis 3:5 (Amplified)
Adam and Eve both fell into Satan's trap, which was fuelled by the lie that "you will be like God." Eating the fruit did not add anything to them, but rather took something away from them. They felt their guilt and saw their shame after being robbed of their rightful place with God, which caused them to flee from God.
Adam's fall is the source of our sinful worthlessness, our utter incapability of saving ourselves.
The gospel tells us that we are complete only in Christ. Nonetheless, some believers feel “incomplete” if they don’t own the next best thing or latest must-have product. Isn't this why we have a pervasive consumerism culture that caters to our needs? Do we not incline our ears to hear their (marketing) "priests and prophets" urging us to buy and buy some more? Do we not feel a rush of "god-like power" every time we flash our credit cards in order to possess what pleases our eyes? This occurred at the church of Colossae.
The Apostle Paul had to contend with false teachers who taught believers that they were incomplete unless they embraced an eclectic mix of empty philosophy and esoteric religious beliefs in addition to Jesus. They were enslaved by a false idea and were not living in the truth of the gospel.
Knowing that you are made whole in Christ leads to faithfulness and fruitfulness. When your identity is founded on who you are in Christ rather than what you have, you are set free from the desire to possess the many in order to be freely possessed by the One.