Tell me, my dear brethren, what are the penances that are given to you? Alas! A few rosaries, some litanies, some almsgivings, a few little mortifications. Do all of these things, I ask you, bear any proportion to our sins which deserve eternal punishment? There are some who carry out their penance walking along or sitting down; that is not doing it at all. Unless the priest tells you that you may do it while walking along or sitting down, you should do your penance on your knees.
(from the Book “The Sermons of The Cure of Ars”, TAN Books 2013, Page 155)