Feelings change. You can’t promise to have a feeling. So if love is a feeling, the marriage vow makes no sense at all. But the vow does make sense because love is not a feeling. What is it, then? Love is a commitment of the will to the true good of another person. Of course, people who love each other usually do have strong feelings too, but you can have those feelings without having love. Love, let me repeat, is a commitment of the will to the true good of another person.
J. Budziszewski