Fear is the main source of superstition, and one of the main sources of cruelty. To conquer fear is the beginning of wisdom.

More important than the curriculum is the question of the methods of teaching and the spirit in which the teaching is given

We must be sceptical even of our scepticism.

Intelligence, it might be said, has caused our troubles; but it is not unintelligence that will cure them. Only more and wiser intelligence can make a happier world

Frege has the merit of ... finding a third assertion by recognising the world of logic which is neither mental nor physical.

No man can be a good teacher unless he has feelings of warm affection toward his pupils and a genuine desire to impart to them what he believes to be of value.

We know very little, and yet it is astonishing that we know so much, and still more astonishing that so little knowledge can give us so much power.