That's good advice for a married couple. If you're love has grown cold, repent. And begin doing the things you did at first, the things that enabled you to fall in love to begin with. Don't worry about the feelings. Just act as if you loved one another.
Feelings follow thoughts and actions.
Ted Engstrom and Robert Larson, in their book The Fine Art of Friendship, tell about a man named Joe who had been married three years and who wanted a divorce. He no longer found his wife interesting or attractive. He considered her a poor housekeeper who was overweight, and he just wanted to divorce her. But he was embittered, and he wanted to make her life as miserable as possible. So he talked it over with a psychologist friend of his, and his friend told him what to do.