…for I called him alone, and blessed him, and increased him. – Isaiah 51:2

Think, my brethren, of the power for good or evil which may be enshrined in a single human life. What mischievous results may come of one man! One sinner destroyeth much good, and if there were but one person left who had knowledge of the ways of vice and the words of blasphemy that one man would suffice to infect the race with his abominations. If evil be so mighty, is not good with God in it quite as powerful? We may rightly measure quantities in reference to many things, but with others it is absurd. It would be ridiculous to measure the power of fire by the quantity which burns on the hearth. Give us fit materials and a single match, and you shall see what fire can do. If ordinary fire, that may so readily be extinguished, is thus powerful, who shall venture to measure the power of the fire from heaven, which neither men nor devils can quench, the fire which fell at Pentecost, and burns among us still. Ye carry fire, ye servants of God; ye work with a heaven-sent force of boundless energy. Why, therefore, should you despair? If all the lights in the world were put out except a solitary lamp, there is enough fire in one wick to kindle all the lamps in the universe. What inch of ground remains for despair to stand upon?

Abraham was distinguished from other men only by the grace of God. What grander difference can there be than that which is established by the existence of faith in the heart? Thus Abraham was in the fullest sense a lone man, unsupported by any of those outward distinctions which enable some men to do more than others. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1596.cfm