"I understood the importance in principle of public key cryptography but it's all moved much faster than I expected. I did not expect it to be a mainstay of advanced communications technology."
"What happened in America in the 1860s was a war of secession, a war of independence, no different in principle from what happened in America in the 1770s and 1780s."
"A thing moderately good is not so good as it ought to be. Moderation in temper is always a virtue but moderation in principle is always a vice."