Since love is kindled in our hearts by the breath of some celestial spirit, when one loves, the other always return love; and often when one is thinking, the other is thinking the same thing in the same way. For since the heavenly father, as the common cause of all things, enfolds both, he creates the mutual love of the lovers; and the love of the lover proceeding from heaven through man, reflects back, now in the earthly face of humanity, then in the vaults of heaven: in turn, it gives birth to Echo.
Marsilio Ficino, The Letters of Marsilio Ficino Volume 3. trans. Language Department of the School of Economic Science, London (New York: Gingko Pressm 1985), 51-2.