A small or seemingly insignificant thing that has the potential to grow or develop into something vast or formidable. Originating from the Parable of the Mustard Seed in the Bible (in the Gospels of Matthew, Mark, and Luke), describing how the Christian faith spreads and flourishes from small beginnings. Every child is a grain of mustard seed—at once relatively small in the scope of the world, but having within them the power to shape the very course of human existence.