Prometheus gave humans fire in order to advance our minds, that is what the ancient Greeks believed. Humans were made last, and there was nothing left to give us in the way of natural weapons or abilities, and so the Gods gave us an amazing mind, that we could be superior to all the animals around us. The beginning of that development was the gift of fire that the Titan blessed us with. While most people of our modern Age may think nothing of the story outside of a cultural worldview long passed, science proves that it's actually true. As with mostly all the Myths, our educational system of today leads us to discount rather than examine them.
Prehistoric man did indeed have fire, and we now know that because they had fire and were able to cook with it, the human brain grew. Because of the fact that food became more digestible, far more nutrients went into the body as opposed to earlier primates who couldn't use the tool. In short, it is a literal fact that the gift of fire advanced the human mind. In the broader view of humanity, it literally gave a rocket boost to human evolution itself. Fire later became used in sacrifices and was considered a sign of the presence of a God. Fire, when big enough, would also keep nightly predators away, and so it became known as that which drives away evil.
Of course, the ancient Greeks had no knowledge of this prehistoric and modern science, so how did they know? Who told them? The Higher Powers and Intelligences of the universe, whom all humans have an inherent connection and quest for because of schema, created that realization. Simply put, the Gods told them. Today we are often raised and trained to be afraid of fire. I remember when I was growing up, just lighting a stove scared or made me very nervous. We should most certainly be careful with it, because after all, it did come from Powers beyond our control, but I think that the more we grow accustomed to the natural world and our natural selves, we understand the Divinity and wonderfulness of it all.
In the Goodness of the Gods,