William Charles Mark Kent, 1911 Encyclopædia Britannica (1911)
“ No matter what he happened at the moment to take in hand, the art he applied to it was always that highest art of all, the ars celare artem. His mastery of the lightest but most essential weapon in the armoury of the diplomatist, tact, came to him as it seemed intuitively, and from the outset was consummate. Talleyrand himself would have had no reason, even in Henry Bulwer’s earliest years as an attaché, to write entreatingly, “pas de zèle,” to one who concealed so felicitously, even at starting, a lynx-like vigilance under an aspect the most phlegmatic. ”
