"the Roman Catholic Church can perform ceremonies sufficient to remove you from where you now languish"

   Hearing a subterranean Sancho's voice emerge from a pothole Quixote believes him to be dead and trapped in purgatory, promising to pay any amount to release his soul.  In the late Middle-Ages the sale of holy indulgence by fraudlent 'pardoners' was a widespread practice, based on a wilful misintrerpretation of the Catholic Church's doctrine allowing exemption from punishment or penance for one's sins. 

   The practice was nevertheless 'indulged' itself as a means of financing holy works by some within the Church, such as Dominican preacher Johann Tetzel to whom was attributed the catchy jingle "As soon as a coin in the coffer rings, a soul from purgatory springs".  Dispute over this issue, and similar abuses of scriptural authority, was part of the impetus for the Protestant Reformation, as stated in Martin Luther's Ninety-Five Theses of 1517.