And after the earthquake a fire; but the LORD was not in the fire: and after the fire a still small voice. – 1 Kings 19:12

Many have been converted to God by the still small voice whom no wind, though it rose to a hurricane, no earthquake, though it rent the world to its centre, and no fire, though it licked up the forests, could ever move. A gentle word has done it. Sometimes that still small voice has come to us by apparently very, very inadequate means. It is astonishing what little things God will use when He pleases to do so. He wanted to soften the heart of that rough prophet Jonah, and He sent a worm and a gourd, and they did it. He would bring Peter to repentance, and He bade a cock to crow… Means may seem to be absolutely ridiculous, yet God maketh use of the things that are not, as though they were. I remember to have heard the story of a man, a blasphemer, profane, an atheist, who was converted singularly by a sinful action of his. He had written on a piece of paper, “God is nowhere,” and bade his child read it, for he would make his child an atheist too. And the child spelt it, “God is n-o-w h-e-r-e-God is now here.” It was a truth, instead of a lie, and the arrow pierced the man’s own heart. I remember one who had lived a life of gross iniquity who stepped into Exeter Hall and found Christ there. It was not my sermon, however, that God blessed: it was only this. I read the hymn, “Jesus, lover of my soul.” Just those words touched his heart. “Jesus, lover of my soul,” he said to himself. “Did Jesus love my soul? Then how is it that I could have lived as I have done?”; and that word broke him down. God works great results by little things. A little hymn learnt at the Sunday School is sung at home by a little prattler, and the heart of the father is softened by it. One little sentence uttered by a friendly visitor reaches a mother’s conscience and impresses her heart. Ay, and God can use the quiet of the evening, or the stillness of the night, or a flash of lightning, or a peal of thunder, or a dewdrop, or a little flower-He can use anything He wills to bring His banished home. Often doth the Spirit speak thus with a still small voice. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/3498.cfm