N.T. Wright, Surprised By Hope, 182:
One of the primary laws of human life is that you become like what you worship; what’s more, you reflect what you worship not only back to the object itself but also outward to the world around. Those who worship money increasingly define themselves in terms of it and increasingly treat other people as creditors, debtors, partners, or customers rather than as human beings. Those who worship sex define themselves in terms of it (their preferences, their practices, their past histories) and increasingly treat other people as actual or potential sexual objects. Those who worship power define themselves in terms of it and treat other people as either collaborators, competitors, or pawns. These and many other forms of idolatry combine in a thousand ways, all of them damaging to the image-bearing quality of the people concerned and of those whose lives they touch.
Wright’s point is that idolatry is more than a mere internal heart problem — idolatry is what we project onto others. Idolatry de-values others and becomes a relational cancer in our families, our communities, and our churches. In other words, personal idols dehumanize us, dehumanize our evaluation of others, and necessarily erode community.