Man's unconscious, and how he let in the light

Narrator: Since ancient times there have been three great changes in man's idea of himself. Three major blows dealt us in our vanity. Before Copernicus, we thought we were the centre of the universe, that all the heavenly bodies revolved around our Earth. But the great astronomer shattered that conceit and we were forced to admit our planet is but one of many which swing around the sun, that there are other systems beyond our solar system in myriad worlds. Before Charles Darwin man believed he was a species unto himself separate and apart from the animal kingdom. But the great biologist made us see that our physical organism is the product of a vast evolutionary process whose laws are no different for us than for any other form of animal life. Before Sigmund Freud, man believed that what he said and did were the products of his conscious will alone. But the great psychologist demonstrate the existence of another part of our mind, which functions in darkest secrecy and can even rule our lives. This is the story of Freud's descent into a region almost as black as hell itself: Man's unconscious, and how he let in the light