The past is never dead; it's not even past. This is especially true in detective fiction.
Cryptography is about communication in the presence of adversaries.
You can’t let success get to your head and failure to your heart.
"The past is always present in the way we live now."
Technology is nothing. What's important is that you have a faith in people, that they're basically good and smart, and if you give them tools, they'll do wonderful things with them.