Johannes Kepler1571–1630- Epitaph he composed for himself a few months before he died, as quoted by Steven G. Krantz, Brian E. Blank, Calculusː Multivariable (2006) p. 126.
- As quoted in Karl Fink, A Brief History of Mathematics (1903), tr. W. W. Beman and D. E. Smith
- Translated by Edward Rosen, Kepler’s Conversation with Galileo’s Sidereal Messenger (1965), p. 39.
