God works his ways through simple things. Think about it. Jesus did a series of relatively simple things. He showed up for a little while (about 3 years), did a few healing miracles, walked on water, went into the catering business on a Galilean hillside, said some amazing words, died on a cross, returned resurrected, and then left. On Pentecost, God used a simple thing, language, to reach all kinds of people. All these simple acts changed the world. God works through simple things.