What the head-carver had best do is to serve me with what they call ollas podridas (and the rottener they are the better they smell); and he can put whatever he likes into them, so long as it is good to eat, and I’ll be obliged to him, and will requite him some day.
…Don Quixote listened to the ragged knight of the Sierra, who began by saying: "Of a surety, senor, whoever you are, for I know you not, I thank you for the proofs of kindness and courtesy you have shown me, and would I were in a condition to requite with something more than good-will that which you have displayed towards me in the cordial reception you have given me; but my fate does not afford me any other means of returning kindnesses done me save the hearty desire to repay them."
Forgive me, fair ladies, if, through inadvertence, I have in aught offended you; for intentionally and wittingly I have never done so to any; and pray to God that he deliver me from this captivity to which some malevolent enchanter has consigned me; and should I find myself released therefrom, the favours that ye have bestowed upon me in this castle shall be held in memory by me, that I may acknowledge, recognise, and requite them as they deserve.
This same Casildea, then, that I speak of, requited my honourable passion and gentle aspirations by compelling me, as his stepmother did Hercules, to engage in many perils of various sorts, at the end of each promising me that, with the end of the next, the object of my hopes should be attained; but my labours have gone on increasing link by link until they are past counting, nor do I know what will be the last one that is to be the beginning of the accomplishment of my chaste desires.
This sin, so far as it has lain in my power, I have endeavoured to avoid ever since I have enjoyed the faculty of reason; and if I am unable to requite good deeds that have been done me by other deeds, I substitute the desire to do so; and if that be not enough I make them known publicly; for he who declares and makes known the good deeds done to him would repay them by others if it were in his power, and for the most part those who receive are the inferiors of those who give.
"If Sancho," replied Don Quixote, "I were to requite thee as the importance and nature of the cure deserves, the treasures of Venice, the mines of Potosi, would be insufficient to pay thee.
…from Sancho’s neck, and with something like shame and confusion of face went off all of them and left him; whereupon he, seeing himself safe out of that extreme danger, as it seemed to him, ran and fell on his knees before the duchess, saying, "From great ladies great favours may be looked for; this which your grace has done me today cannot be requited with less than wishing I was dubbed a knight-errant, to devote myself all the days of my life to the service of so exalted a lady.
There are no more uses of "unrequited" in the book.
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It’s a sad song about the heartbreak of unrequited love.