The spontaneous power of the child, his demand for self-expression, can not by any possibility be suppressed.

There is no greater egoism than that of learning when it is treated simply as a mark of personal distinction to be held and cherished for its own sake. ... [K]knowledge is a possession held in trust for the furthering of the well-being of all

Faith in the possibilities of continued and rigorous inquiry does not limit access to truth to any channel or scheme of things. It does not first say that truth is universal and then add there is but one road to it.

Intelligence is in constant process of forming, and its retention requires constant alertness in observing consequences, an open-minded will to learn, and courage in readjustment.

By reading the characteristic features of any man's castles in the air you can make a shrewd guess as to his underlying desires which are frustrated.

Some things which are remote in space and time from a living creature, especially a human creature, may form his environment even more truly than some of the things close to him.

Conflict is the gadfly of thought. It stirs us to observation and memory. It instigates invention. It shocks us out of sheep-like passivity, and sets us at noting and contriving…conflict is a sine qua non of reflection and ingenuity.