"Of Architecture", Parentalia; or Memoirs of the Family of the Wrens, comp. by his son Christopher (1750, reprinted 1965), Appendix, p. 351.
Christopher Wren Quotes
“A time will come when men will stretch out their eyes. They should see planets like our Earth.”
Inaugural Lecture as Professor of Astronomy, Gresham College, as quoted in If the Universe is Teeming with Aliens-- where is Everybody? Fifty Solutions to the Fermi Paradox and the Problem of Extraterrestrial Life, by Stephen Webb (2002), p. 150.