"I dare say that by now, citizen," the brigand continued imperturbably, "you will have guessed who I am. You and I have oft crossed invisible swords before; but this, methinks, is the first time that we have met face to face.
Baroness Orczy. The League of the Scarlet Pimpernel
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he had the faculty, so invaluable in society, of composure and imperturbable self-possession.
Leo Tolstoy. War and Peace: With bonus material from Give War and Peace A Chance by Andrew D. Kaufman