"The only way love can be shown in this world is by sacrifice --namely, the surrender of one thing for another. Love is essentially bound up with choice, and choice is a negation, and negation is a sacrifice. When a young man sets his heart upon a young woman and asks her to marry him, he is not only saying "I choose you"; he is also saying "I do not choose, I reject, all others. I give them all up for you." Apply this to the problem of lust."