This is a quote from "Who Cares?" which is a speech from General William Booth (the 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. There has been much of human happiness, much clapping of hands and shouting of praises - very much of heaven on earth.
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. With the light that has now broken in upon your mind, and the call that is now sounding in your ears, and the beckoning hands that are now before your eyes, you have no alternative. To go down among the perishing crowds is your duty. Your happiness from now on will consist in sharing their misery, your ease in sharing their pain, your crown in helping them to bear their cross, and your heaven in going into the very jaws of hell to rescue them.
Now, what will you do?"