There were two Titan Brothers by the names of Prometheus and Epimetheus.
Epimetheus was the younger of the pair and cared very little of what was to come. He was always concerned with the past, and therefore decided to remain with other gods and goddesses.
Living with the Mighty Ones to merely drink nectar and eat ambrosia was not ideal for Prometheus (the elder brother), though, for he was concerned of the future and making the world better. He had chosen to live amongst human beings.
Once it was upon spectating the humans that Prometheus had realized just how unpleasant their lives were. They were nearly always cold and hungry. Prometheus decided that if they were to have fire, as the gods and goddesses did, their lives could be much better.
Boldy he went to Jupiter, asking for him to give them fire.
Not a spark I will give! If beings were to have fire, they could quite easily use it to strengthen themselves and overcome us. Only us Mighty Ones shall live in this luxury.
Mankind shall have fire in spite of the tyrant who lives on the mountain top!
In spite of Jupiter, he had known that he wanted to be a little helpful to the humans. He found a plant with a pith able to store fire easily and touched it to the sun as soon as it had risen, planning to bring this fire to the humans and teach them to produce more.