Aristotle hints something of this when he says that by Ideas Plato meant what Pythagoras meant by “number” when he taught that this is a world of numbers (meaning presumably that the world is ruled by mathematical constancies and regularities). Plutarch tells us that according to Plato “God always geometrizes”; or, as Spinoza puts the same thought, God and the universal laws of structure and operation are one and the same reality. To Plato, as to Bertrand Russell, mathematics is therefore the indispensable prelude to philosophy, and its highest form; over the doors of his Academy Plato placed,
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