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

If the members who compose a society lived on continuously, they might educate the new-born members, but it would be a task directed by personal interest rather than social need. Now it is a work of necessity.

The future of our civilisation depends upon the widening spread and deepening hold of the scientific habit of mind.

The plea for the predominance of learning to read in early school life because of the great importance attaching to literature seems to be a perversion.

Change as change is mere flux and lapse; it insults intelligence. Genuinely to know is to grasp a permanent end that realizes itself through changes.

It is commonplace that a problem stated is well on its way to solution, for statement of the nature of a problem signifies that the underlying quality is being transformed into determinate distinctions of terms and relations or has become an object of articulate thought.

Experience alone cannot deliver to us necessary truths; truths completely demonstrated by reason. Its conclusions are particular, not universal.