“A reasonable probability is the only certainty.”
“Reason can get you to probability, but only commitment can get you to certainty.”
“It does take great maturity to understand that the opinion we are arguing for is merely the hypothesis we favor, necessarily imperfect, probably transitory, which only very limited minds can declare to be a certainty or a truth.”
“Tolerance grows only when faith loses certainty; certainty is murderous.”
“The only certainty is death.”
“Feeling lost, crazy and desperate belongs to a good life as much as optimism, certainty and reason.”