All these profound matters must be suggested in short and imperfect phrases; and the shortest statement of one aspect of this illumination is to say that it is the discovery of an infinite debt. It may seem a paradox to say that a man may be transported with joy to discover that he is in debt. But this is only because in commercial cases the creditor does not generally share the transports of joy; especially when the debt is by hypothesis infinite and therefore unrecoverable. But here again the parallel of a natural love-story of the nobler sort disposes of the difficulty in a flash. There the infinite creditor does share the joy of the infinite debtor; for indeed they are both debtors and both creditors. In other words debt and dependence do become pleasures in the presence of unspoilt love; the word is used too loosely and luxuriously in popular simplifications like the present; but here the word is really the key. It is the key of all the problems of Franciscan morality which puzzle the merely modern mind; but above all it is the key of asceticism. It is the highest and holiest of the paradoxes that the man who really knows he cannot pay his debt will be for ever paying it. He will be for ever giving back what he cannot give back, and cannot be expected to give back. He will be always throwing things away into a bottomless pit of unfathomable thanks. Men who think they are too modern to understand this are in fact too mean to understand it; we are most of us too mean to practise it. We are not generous enough to be ascetics; one might almost say not genial enough to be ascetics. A man must have magnanimity of surrender, of which he commonly only catches a glimpse in first love, like a glimpse of our lost Eden. But whether he sees it or not, the truth is in that riddle; that the whole world has, or is, only one good thing; and it is a bad debt.
— G.K. Chesterton, Saint Francis of Assisi Chapter V