It is interesting that the roots of the 17th-century mechanistic world view can be found in ancient mystical religion. Indeed, the mechanistic view was a synthesis of two traditions of thought, both of which were based on the mystical insight that reality is timeless and changeless. One of these traditions stems from Pythagoras and Plato, who were both fascinated by the eternal truths of mathematics. In the 17th century, this evolved into a view that nature was governed by timeless ideas, proportions, principles, or laws that existed within the mind of God. This world view became dominant and, through philosophers and scientists such as Copernicus, Kepler, Descartes, Galileo and Newton, it was incorporated into the foundations of modern physics.