What I learned on my own I still remember

Things always become obvious after the fact

We tend to treat our knowledge as personal property to be protected and defended. It is an ornament that allows us to rise in the pecking order. [...] We take what we know a little too seriously.

Read books are far less valuable than unread ones.

We should reward people, not ridicule them, for thinking the impossible.

It might be useful to be able to predict war. But tension does not necessarily lead to war, but often to peace and to denouement.

Doctors most commonly get mixed up between absence of evidence and evidence of abense