From Habit of Being, pg 307...

The Church is founded on Peter who denied Christ three times and couldn't walk on the water by himself. All human nature vigorously resists grace because grace changes us and the change is painful. Priests resist it as well as others. To have the Church be what you want it to be would require the continuous miraculous meddling of God in human affairs, whereas it is our dignity that we are allowed more or less to get on with those graces that come through faith and the sacraments and which work thorugh our human nature...Human nature is so faulty that it can resist any amount of grace and most of the time it does. The Church does well to hold her own; you are asking that she show a profit. When she shows a profit you have a saint, not necessarily a canonized one. -- (Flannery O'Connor to Cecil Dawkins 12/8/58. Habit of Being, 307) (via Open Book)