And there was great joy in that city. – Acts 8:8

Depend upon it there shall come a great blessing to any of you who feel the soul travail that brings souls to God. Your own heart will be watered. You know the old illustration, so often used that it is now almost hackneyed, of the two travelers, who passed a man frozen in the snow, and thought to be dead; and the one said, “I have enough to do to keep myself alive, I will hasten on;” but the other said, “I cannot pass a fellow-creature while there is the least breath in him.” He stooped down and began to warm the frozen man by rubbing him with great vigor; and at last the poor fellow opened his eyes, came back to life and animation, and walked along with the man who had restored him to life; and what think you was one of the fist sights they saw? It was the man who so selfishly took care of himself frozen to death. The good Samaritan had preserved his own life by rubbing the other man; the friction he had given had caused the action of his own blood, and kept him in vigor. You will bless yourselves if you bless others.

Moreover, will it not be a joy to feel that you have done what you could? …If men are lost, it is some satisfaction to us that they were not lost because we failed to tell them the way of salvation. But what a comfort it will be to you supposing you should be successful in bringing some to Christ. Why it will set all the bells of your soul ringing. There is no greater joy except the joy of our own communion with Christ, than this of bringing others to trust the Saviour. Oh seek this joy and pant after it. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1009.cfm