Geometry has two great treasures: one is the Theorem of Phythagoras, the other the division of a line in extreme and mean ratio. The first we can compare to a mass of gold; the other we may call a precious jewel.

— Johannes Kepler, Mysterium Cosmographicum (1596)

Source: https://books.google.com/books?id=3hkPAAAAIAAJ

Translated and quoted by Karl Fink (1890; English 1903).

Topics: mathematics