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In this extraordinary period in Western scientific history, Thales (626–548 BCE) emerged as the first great pre-Socratic philosopher and the creator of natural philosophy. In his search for the origins of the natural world, he believed the origin of all things, arche, was water because nature begins with water and returns to water. The Greek word arche, means the original, the prima materia, the beginning, the source of all things. Later, Carl Jung would develop the concept of archetypes, which are the core universal forces of the human psyche.