Now, the gospel brings us a new freedom from lying. How? We don't overcome lying by simply saying to ourselves, "stop lying!" Rather, we ask, why do I lie? What leads me to do it? And the answer is always that something that we delight in (i.e. worship or rely on for our worth) more than God is threatened. And so we lie. But how do we change? We cannot "just say no". The most effective way of withdrawing the heart from one object is not by turning it away upon desolate and unpeopled vacancy, but by presenting to its regard another object more alluring still.

Thomas Calmers - Expulsive power of new affection