“The prophet Jonah, in the digestive tract of a great fish beneath the Mediterranean Sea, made this observation: ‘Those who cling to worthless idols forfeit the grace that could have been their’ (Jonah 2:8).
An idol is something more than a grotesque statue with big lips and a ruby in its navel. It’s a God-substitute. It’s something–anything–that we value higher than God. In order to cling to such an idol, we make a trade.
Our sexual behavior reveals who or what rules our lives (see Romans 1:18-29). Sexual sin is idolatry because it puts our desires in the place of God.
Those who turn from God to embrace a God-substitute suffer terrible loss. Why? Because they were made to find joy in God, not the substitute. They swap God’s present and future blessing for something they can immediately see, taste, or feel. But that something never satisfies.
– Randy Alcorn, The Purity Principle, p.12