Repentance: by CS Lewis

2 Corinthians 7:10 "Godly sorrow brings repentance that leads to salvation and leaves no regret, but worldly sorrow brings death."

Remember, this repentance, this willing submission to humiliation and a kind of death, is not something God demands of you before He will take you back and which He could let you off of if He chose: it is simply a description of what going back to Him is like. If you ask God to take you back without it, you are really asking Him to let you go back without going back. It cannot happen. Very well, then, we must go through with it. But the same badness which makes us need it, makes us unable to do it. Can we do it if God helps us? Yes, but what do we mean when we talk of God helping us? We mean God putting into us a bit of Himself, so to speak. He lends us a little of His reasoning powers and that is how we think: He puts a little of His love into us and that is how we love one another. When you teach a child writing, you hold its hand while it forms the letters: that is, it forms the letters because you are forming them. We love and reason because God loves and reasons and holds our hand while we do it. Now if we had not fallen, that would all be plain sailing. But unfortunately we now need God's help in order to do something which God, in His own nature, never does at all - to surrender, to suffer, to submit, to die. Nothing in God's nature corresponds to this process at all. So that the one road for which we now need God's leadership most of all is a road God, in His own nature, has never walked. God can share only what He has: this thing, in His own nature, He has not.

Luke 13:1-3 Now there were some present at that time who told Jesus about the Galileans whose blood Pilate had mixed with their sacrifices.  Jesus answered, “Do you think that these Galileans were worse sinners than all the other Galileans because they suffered this way?  I tell you, no! But unless you repent, you too will all perish.