Imagine a mountain so tall no man or woman has ever seen its summit. Imagine the home of the mighty gods and goddesses. Imagine Mount Olympus.
On top of Mount Olympus there was a throne. Upon the throne would sit father god Zeus, the cloud-compeller, whose temple is the sky. From that throne Zeus could see everything.
One time Zeus looked down and he saw a little island in the blue Aegean Sea. And riding a dolphin, as though it was a pony, through the shallows towards that island, he saw a nymph, a magic woman.
She stepped from the back of the dolphin. She waded up the shallows, she lay on her belly in the sand and she fell asleep.
Poseidon laughed. "This is Thetis. Surely you know of her? Surely you know of the prophecy that hovers over her?
Zeus was filled with desire for her. He called his brother, the god of the sea, Poseidon.
Hesaid, "Who is she?"
They say one day she will have a son and the son will grow up to be greater than his father. If I were you, I wouldn't pay her one of your visits."