It is an hypothesis that the sun will rise tomorrow: and this means that we do not know whether it will rise.
(Ludwig Wittgenstein (1889-1951), Austrian-British philosopher. Trans. by D.F. Pears and B.F. McGuinness, Routledge and Kegan Paul (1961). Tractatus Logico-Philosophicus, 6.36311.)
Death and the sun are two things we cannot look on with a steady eye.
(François, Duc De La Rochefoucauld (1613-1680), French writer, moralist. repr. F.A. Stokes Co., New York (c. 1930). Moral Maxims and Reflections, no. 27 (1665-1678), trans. London (1706).)