When someone gives a promise ring to their partner, they have to say something with it, and it is a challenging task but not an impossible thing. First of all, every couple has a love language of their own. Using that personalized love language instead of using a love quote or very general poetry would be more effective because it will represent you as a genuine being. Moreover, you can facilitate your own words with quotations or poetry to make your proposal memorable for a lifetime. But again, it is a subjective decision to make.