Science seems to be at war with itself.... Naive realism leads to physics, and physics, if true, shows naive realism to be false. Therefore naive realism, if true, is false; therefore it is false.

With subjectivity in philosophy, anarchism in politics goes hand in hand. Already during Luther's lifetime, unwelcome and unacknowledged disciples had developed the doctrine of Anabaptism, which for a time dominated the city of Munster. The Anabaptists repudiated all law since they held that good men will be guided at every moment by the Holy Spirit, who can not be bound by formulas. From this premise they arrive at communism and sexual promiscuity; they were therefore exterminated after a heroic resistance.

Whenever you find yourself getting angry about a difference of opinion, be on your guard; you will probably find, on examination, that your belief is going beyond what the evidence warrants.

It is obviously possible that what we call waking life may only be an unusual and persistent nightmare.

There is no excuse for deceiving children. And when, as must happen in conventional families, they find that their parents have lied, they lose confidence in them and feel justified in lying to them.

I can only say that, while my own opinions as to ethics do not satisfy me, other people's satisfy me still less.

Patriots always talk of dying for their country and never of killing for their country.