Thomas Chalmers, the great 19th century Scottish Presbyterian minister said,

There is not one personal transformation in which the heart is left without an object of ultimate beauty and joy. The heart’s desire for one particular object can be conquered, but its desire to have some object is unconquerable. The only way to disposses the heart of an old affection is by the expulsive power of a new one.

This is from his sermon, “The Expulsive Power of a New Affection.”