It will now be seen, perhaps, why it is that the heart keeps by its present affections with so much tenacity when the attempt is to do them away by a mere process of extirpation. It will not consent to be so desolated. The strong man, whose dwelling-place is there, may be compelled to give way to another occupier, but unless another, stronger than he, has power to dispossess and to succeed him, he will keep his present lodgement inviolable. The heart would revolt against its own emptiness…
It is not enough, then, to argue the folly of an existing affection. In a word, if the way to disengage the heart from the positive love of one great and ascendant object is to fasten it in positive love to another, then it is not by exposing the worthlessness of the former, but by addressing to the mental eye the worth and excellence of the latter, that all old things are to be done away, and all things are to become new…The only way to dispossess [the heart] of an old affection is by the expulsive power of a new one.-Thomas Chalmers, “The Expulsive Power of a New Affection”