William Booth, founder of the Salvation Army:

You must do it  You cannot hold back.  You have enjoyed yourself in Christianity long enough.  You have had pleasant feelings, pleasant songs, pleasant meetings, pleasant prospects…..now then, go to God and tell Him you are prepared as much as necessary to turn your back upon it all, and that you are willing to spend the rest of your days struggling in the midst of these perishing multitudes, whatever it may cost you.  You must do it.