[From Part I Chapter V, " Our Duty to Remain in Love's Debt to Each Other "] Owe no one anything, except to love each other, for the one who loves another has fulfilled the law. (Romans 13:8 ESV) “Let us begin with a little thought-experiment. If a lover had done something for the beloved, something humanly speaking so extraordinary, lofty, and sacrificial that we men were obliged to say, ‘This is the utmost one human being can do for another’—this certainly would be beautiful and good. But suppose he added, ‘See, now I have paid any debt.’ Would this not be speaking unkindly, coldly, and harshly? Would it not be, if I may say it this way, an indecency which ought never to be heard, never in the good fellowship of true love? If, however, the lover did this noble and sacrificial thing and then added, ‘But I have one request—let me remain in debt’: would not this be speaking in love?” [1]
(or, A Fragment of Theology)