Predition is risky, especially of the future.
Never express yourself more clearly than you are able to think.
Some things are so serious, they can only be joked about.
Anybody who is not shocked by this subject has failed to understand it. [of quantum mechanics]
If quantum mechanics hasn't profoundly shocked you, you haven't understood it yet.
Every sentence I utter must be understood not as an affirmation, but as a question.