"Do you know what it is you are rejecting this morning? You are rejecting Christ, your only Savior. 'Other foundation can no man lay;' 'there is none other name given among men whereby we must be saved.' My brother, I cannot bear that ye should do this, for I remember what you are forgetting: the day is coming when you will want a Savior. It is not long ere weary months shall have ended, and your strength begin to decline; your pulse shall fail you, your strength shall depart, and you and the grim monster—death, must face each other. What will you do in the swellings of Jordan without a Savior? Death-beds are stony things without the Lord Jesus Christ. It is an awful thing to die anyhow; he that hath the best hope, and the most triumphant faith, finds that death is not a thing to laugh at. It is a terrible thing to pass from the seen to the unseen, from the mortal to the immortal, from time to eternity, and you will find it hard to go through the iron gates of death without the sweet wings of angels to conduct you to the portals of the skies. It will be a hard thing to die without Christ." From Spurgeon's sermon Compel Them to Come In
Further recommended reading & listening:
The Best of The Daily Spurgeon
The Forgotten Spurgeon, by Iain Murray