A means of repairing a sin committed, and obtaining pardon for it, consisting partly in the performance of expiatory rites, partly in voluntary submission to a punishment corresponding to the transgression. Penance is the fourth of seven sacraments in the Roman Catholic Church.
Three conditions are necessary for Penance: contrition, which is sorrow for sin, together with a purpose of amendment; confession of sins without any omission; and satisfaction by means of good works. Thomas Aquinas
This is me, a sinner on whom the Lord has turned his gaze. And this is what I said when they asked me if I would accept my election as pontiff. I am a sinner, but I trust in the infinite mercy and patience of our Lord Jesus Christ, and I accept in a spirit of penance. Pope Francis
I've always felt like an alien trapped in a human form. We all do at some time or other; for me it's a permanent state, and I'm still unsure if Earth is a penance or a reward. Douglas Coupland
Start the practice of self-control with some penance; begin with fasting. Mahavira
The safest and most suitable form of penance seems to be that which causes pain in the flesh but does not penetrate to the bones, that is, which causes suffering but not sickness. Saint Ignatius