The gospel to the Christian is a thing of power. What is it that makes the young man devote himself as a missionary to the cause of God, to leave father and mother, and go into distant lands? It is a thing of power that does it—it is the gospel. What is it that constrains yonder minister, in the midst of the cholera, to climb up that creaking staircase, and stand by the bed of some dying creature who has that dire disease? It must be a thing of power which leads him to venture his life; it is love of the cross of Christ which bids him do it. What is that which enables one man to stand up before a multitude of his fellows, all unprepared it may be, but determined that he will speak nothing but Christ and him crucified? What is it that enables him to cry, like the war-horse of Job in battle, Aha! and move glorious in might? It is a thing of power that does it—it is Christ crucified. And what emboldens that timid female to walk down that dark lane in the wet evening, that she may go and sit beside the victim of a contagious fever? What strengthens her to go through that den of thieves, and pass by the profligate and profane? What influences her to enter into that charnel-house of death, and there sit down and whisper words of comfort? Does gold make her do it? They are too poor to give her gold. Does fame make her do it? She shall never be known, nor written among the mighty women of this earth. What makes her do it? Is it love of merit? No; she knows she has no desert before high heaven. What impels her to it? It is the power of the gospel on her heart; it is the cross of Christ; she loves it, and she therefore says—”Were the whole realm of nature mine. That were a present far too small; Love so amazing, so divine, Demands my soul, my life, my all.”

From the Metropolitan Tabernacle Pulpit, Volume 1, Sermon 7-8 by Charles Haddon Spurgeon

https://ccel.org/ccel/spurgeon/sermons01/sermons01.vii.html