The secrets of evolution are death and time-the deaths of enormous numbers of lifeforms that were imperfectly adapted to the environment; and time for a long succession of small mutations.
Carl SaganWe can judge our progress by the courage of our questions and the depth of our answers, our willingness to embrace what is true rather than what feels good.
Carl SaganThe Hindu religion is the only of the World's great faiths dedicated to the idea that the Cosmos itself undergoes an immense, indeed an infinite, number of deaths and rebirths.
Carl Sagan