Every thinker puts some portion of an apparently stable world in peril.

To savages it would seem preposterous to seek out a place where nothing but learning was going on in order that one might learn.

To be interested is to be absorbed in, wrapped up in, carried away by, some object. To take an interest is to be on the alert, to care about, to be attentive.

Knowledge falters when imagination clips its wings or fears to use them.

There's all the difference in the world between having something to say, and having to say something.

Liberty is not just an idea, an abstract principle. It is power, effective power to do specific things. There is no such thing as liberty in general; liberty, so to speak, at large.

Everything depends on the quality of the experience which is had.