We are the culmination of events that conspired to happen. Everyone we run into has an effect, large or small, on us. Teachers go into battle every day to try and force a few facts into a few brains every day, every year. Some days, children will listen to what is being said.
Good teachers will make that golden moment mean something. Great teachers will use it to invoke a way of thinking, a philosophical wedge to make those times where they are being heard worthwhile.