Giacomo Casanova,
The Memoirs of Jacques Casanova de Seingalt…
“ I have always despised those who think there is something dishonourable in the business of a spy. The word sounds ill only to the ill-affected; for a spy is a lover of the state, the scourge of the guilty, and faithful subject of his prince. When I have been put to the test, the feeling of friendship, which might count for something with other men, has never had the slightest influence over me, and still less the sentiment which is called gratitude. I have often, in order to worm out a secret, sworn to be as silent as the grave, and have never failed to reveal it. ”
