While I don't always agree with John Piper on doctrinal issues, he is a model of what a pastor ought to look like, and I would do well to imitate him. Below are a couple of powerful quotations from him.
"The mark of a true Christian, and the mark of a church member in good standing, is not perfection, but the persistent fight of faith that recognizes sin as sin, confesses it, and turns from it in new resolves of holiness again and again." From this sermon."And this faith will fight anything that get's between it and Christ. The distinguishing mark of saving faith is not perfection. The mark of faith is not that I never sin sexually. The mark of faith is that I fight. I fight anything that dims my sight of Jesus as my glorious Savior. I fight anything that diminishes the fullness of the lordship of Jesus in my life. I fight anything that threatens to replace Jesus as the supreme Treasure of my life. Anything that stands between me and receiving Jesus faith fights—not with fists or knives or guns or bombs, but with the truth of Christ." From this sermon.