The utter beauty and freedom of the Gospel of Christ (as compared to the chains of Roman Catholicism) is that penance is neither necessary nor possible.
"But now apart from the Law the righteousness of God has been manifested, being witnessed by the Law and the Prophets even the righteousness of God through faith in Jesus Christ for all who believe; for there is no distinction; for all have sinned and fall short of the glory of God, beiing justified as a gift by His grace through the redemption which is in Christ Jesus;..."
Notice, no penance, no confessional, no priesthood and certainly no pope involved. Rome has manufactured its own self-righteousness which is another gospel...from the darkness. We invite those enslaved to the Roman cult to come out into the light of Christ alone...if you can.
Why did Christ die on the cross?
Luk 13:3 — I tell you, Nay: but,, except ye repent, ye shall all likewise perish.
the word DOUEY RHEIMS translates as penance is
metanoeō
1) to change one's mind, i.e. to repent
2) to change one's mind for better, heartily to amend with abhorrence of one's past sins
The greek word is not Penance it is repentance..