Luke 18:13
But the tax collector stood at a distance [i.e., inconspicuously] and would not even look up to heaven, but struck his chest [i.e., in remorse], saying, 'God, [please] have mercy on a sinner like me.'
Romans 6:21
What benefit did you receive at that time from doing the things you are now ashamed of? For the end of such behavior is [spiritual] death.
2 Corinthians 7:10-11
For the sorrow that God desires produces repentance [i.e., a change of heart and life] that leads to salvation, and which brings no regrets. But the sorrow of the world [i.e., sorrow for wrongdoing for reasons unrelated to God or moral principles] produces [spiritual] death.