"We cannot live on probabilities. The faith in which we can live bravely and die in peace must be a certainty, so far as it professes to be a faith at all, or it is nothing."

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To tell you the truth, the older I get, the less I know. I keep meeting people, both older and younger, who seem to have accrued so much more knowledge or expertise or certainty about who they are and the jobs they do. I just marvel at it.

— Hugh Laurie