People who claim to have found The Key that will unlock all mysteries are generally deserving figures of fun. From Casaubon (in George Eliot's Middlemarch) to the conspiracy theorists, from Communism to The Da Vinci Code and the Jihadists, those with The Answer are foolish, dangerous and often very funny. Yet their outlandish beliefs and practices are merely the surface manifestation of a faith in the unity of things. This article of faith has not only dominated human history, but is implicit in Science, where is it allied to a second: that human reason is capable of understanding this unity.
One rather beautiful example of this is that of the origin of the universe and of life, here briefly expounded by Gottfried Schatz. In just over a thousand words, he follows a beam of light from the Big Bang to the black dragon fish 1,000 metres below the surface of the sea. It's like a prayer.