" The fact that life arose early here gives us little confidence in the belief that life must be common elsewhere. It’s important to emphasize the following point: the analysis doesn’t show that life is rare. “Life is common” remains our best guess position; it’s just that we can’t be confident of the position. "

― , If the Universe Is Teeming with Aliens ... Where Is Everybody?: Fifty Solutions to the Fermi Paradox and the Problem of Extraterrestrial Life