For godly sorrow produces repentance leading to salvation, not to be regretted; but the sorrow of the world produces death. (2 Corinthians 7:10, NKJV)
Sorrow and repentance are two, very different things. This passage discusses two types of sorrow; godly sorrow and worldly sorrow. Only one of them produces repentance. Judas expressed “the sorrow of the world” when he was remorseful over betraying Jesus (Matt. 27:3-5). Such sorrow is directed inward, and leads to spiritual death. Worldly grief over your sins is hopeless and impotent to cleanse its stain and guilt. In Judas’ case, it led him to suicide. Sorrow that is directed toward God leads to repentance. Hearts are changed toward sin and toward God when we sorrow over having wronged God. We ought to recall that every sin we commit against others, is against God (Psalm 51:4). Even though all have sinned, not everyone has godly sorrow for their sins. The challenge of repenting of our sins begins with a heart that is crushed with grief for sinning against God. That is godly sorrow. Godly sorrow is hopeful, and is directed toward God. It produces repentance, and leads to salvation. Which kind of sorrow you have, when you sin? Or, have you so hardened your heart toward God that you are sorry when you sin against His will? Become sensitive to sin, sorrowful toward God, and repent (Acts 17:30-31). When you do, salvation will arise out of sorrow.