People change when the pain associated with the status quo is greater than the pain associated with change. (Carey Nieuwhof, author, speaker)
A lot of people resist change. But, as Nieuwhof notes, we are ready for change when the current situation has become too difficult. Perhaps we’ve put off a medical procedure until the physical pain is so great we can’t stand it anymore. Then we are probably ready for the lesser pain that the medical procedure may cause. Long time gain is more valuable than short term pain.
Now I am glad I sent [the letter to you], not because it hurt you, but because the pain caused you to repent and change your ways (2 Corinthians 7:9).