My answer to a question in Quora: Who was a notable person that was originally evil, but eventually regretted their evil and became good later on?

I apologise if I missed some answers in this thread, but one of more obvious answers is St Paul the Apostle (or Saul, how he was known prior to his inversion on the road to Damascus). Acts 9:1–6 say:

[1] And Saul, yet breathing out threatenings and slaughter against the disciples of the Lord, went unto the high priest,
[2] And desired of him letters to Damascus to the synagogues, that if he found any of this way, whether they were men or women, he might bring them bound unto Jerusalem.
[3] And as he journeyed, he came near Damascus: and suddenly there shined round about him a light from heaven:
[4] And he fell to the earth, and heard a voice saying unto him, Saul, Saul, why persecutest thou me?
[5] And he said, Who art thou, Lord? And the Lord said, I am Jesus whom thou persecutest: it is hard for thee to kick against the pricks.
[6] And he trembling and astonished said, Lord, what wilt thou have me to do? And the Lord said unto him, Arise, and go into the city, and it shall be told thee what thou must do.

There are conflicting interpretaions of this episode, but, in any case, Paul was a changed person since then. An evil man would not write in 1 Corinthians 13:4-7 :

[ 4] Charity suffereth long, and is kind; charity envieth not; charity vaunteth not itself, is not puffed up,

[5] Doth not behave itself unseemly, seeketh not her own, is not easily provoked, thinketh no evil;

[6] Rejoiceth not in iniquity, but rejoiceth in the truth;

[7] Beareth all things, believeth all things, hopeth all things, endureth all things.