A slow purification process

So often I get frustrated when I repent of my sins and tell God that I am going to try to change and then continue to make the same mistakes. However, this evening as I was thinking on that, I realized that even though I do, over the years it becomes less of a temptation and I start to improve in whatever area I am struggling with. I was reminded that sanctification is not simply a one-time event where we are forgiven and immediately change our ways. Rather, sanctification is a process that takes time. God reminded me of the disciples, and how they doubted Jesus over and over again. Through years of the disciples not demonstrating faith, Jesus remained faithful, until finally they had enough faith to sacrifice their lives for His sake.