He who is certain he knows the ending of things when he is only beginning them is either extremely wise or extremely foolish; no matter which is true, he is certainly an unhappy man, for he has put a knife in the heart of wonder.
—Ted Williams (1918–2002) American Sportsperson
Inquiry is fatal to certainty.
—Will Durant (1885–1981) American Historian, Philosopher, Memoirist, Socialist
I tore myself away from the safe comfort of certainties through my love for truth — and truth rewarded me.
—Simone de Beauvoir (1908–86) French Philosopher, Writer, Feminist
When we are not sure, we are alive.
—Graham Greene (1904–91) British Novelist, Playwright, Short Story Writer