De Musica

But let us return to the proposition that music consists first in the ratio, second in the fantasy, third in speech, followed by song, making music with the fingers, the music of the whole body in gymnastics or in dance.... The Pythagoreans, the Platonists, Mercurius, Aristoxenus - they all say that the soul and body of the world and of all animals consist in musical ratios. Even the sacred writings of the Hebrews hold that God disposes all things in number, weight, and measure.

-Marsilio Ficino, De Vita Coelitus Comparanda