I explained to him that the penance Jesus wanted from him was complete obedience,; obey and that’s enough.

"Can’t I do some other penance?"

"Yes, you can allow yourself the penance of being patient with others and the unpleasant things of life; to accept equally the heat and the cold and the rain; to be cheerful when tired and not feeling so well and so on.”

“But,” said Dominic, “these things come to you whether you like it or not.”

“Precisely,” I replied, “offer them willingly to God; there is nothing that will please him more, and you will be doing real penance.” Thus reassured, Dominic was very happy and completely at peace.

– St John Bosco speaking about St Dominic Savio