... knowing what not to know was itself indispensable knowledge.
Knowledge, Power
[Rumsfield's] reply included a complex formulation that would become inextricably associated with him: 'There are known knowns. These are things we know that we know. There are known unknowns. That is to say, there are things that we know we don't know. But there are also unknown unknowns. There are things we don't know we don't know.
Logic, Politics, Education
Only fiction has the power to cross the mental barricades, to make strangers intelligible to each other, because it moves people's hearts as well as engaging their minds.
Books, Fiction
It's only people, as far as we know, who look up at the stars and wonder what they are.
People, Humanity, Stars
Ignorance as a deliberate choice, can be used to reinforce prejudice and discrimination.
Power, Choice, Prejudice