“True contrition is a second innocence” (John Tauler).
We can understand this well if we think, for example, of the repentance of Peter, who wept bitterly when he realised that he had denied the Lord for whom he had declared that he was ready to give his life (Lk 22:55-62). What Jesus had foretold must have burned in his heart, and when he became aware of his denial, this memory and this pain must have led him to a profound conversion, because he loved the Lord.