A hard saying, but one I've found to be true:
Man, to be a human person, must have a master. He is made this way. And being a responsible creature, he must choose his master. In this is his freedom. No one can coerce another's mind without destroying that mind. Even a person in chains 'enjoys' freedom to determine his own thoughts and loyalties. Man is a servant. This is his glory. He finds himself in service. This is the paradox of rational existence. But the problem with people arises when they reject the only One who is big enough to furnish adequate credibility and fulfillment, big enough to be a worthy Master--God, in Christ. It is not that a person simply chooses not to serve God but that he cuts himself off from the possibility of finding what only God can provide. He must serve something, so he creates a master to serve.
--Mildred Wynkoop, A Theology of Love