In Harmonices Mundi III,1 Kepler points out an affinity between the Corpus Hermeticum XIII (The secret sermon on the mountain concerning rebirth and the promise of silence) and the Pythagorean doctrine of the Tetractys. Kepler's aim is to demonstrate that mathematics, particularly in its numerological realm, is the true way to gain knowledge of God and of the presence of His action in the world, as confirmed by the harmonious and mathematical structure of the universe.
Renaissance; Hermetism; Pythagorism; Kepler; Proclus