Robert Murray McCheyne preached in Dundee in Scotland in the early 1800s. Each Saturday he visited the dying in order to prepare his heart, so that on Sunday he might plead with souls the more earnestly. Yet, he said,
I have not been like a shepherd after lost sheep, nor like a physician among dying men, nor like a servant bidding you to the marriage, nor like one plucking brands from the burning! How often have I gone to your houses to try and win souls, and you have put me off with a little worldly talk. I dared not tell you that you were perishing. How often have I sat at some of your tables and yearned for your souls, yet a false shame kept me silent! How often have I gone home crying bitterly, 'Free me from blood-guiltiness, O God!'
All of the above is a quote from And Some Evangelists by Roger Carswell, p 49.