What accumulated knowledge exists in low grade societies is at least put into practice; it is transmuted into character; it exists with the depth of meaning that attaches to its coming within urgent daily interests.

Understanding one another means that objects, including sounds, have the same value for both with respect to carrying on a common pursuit.

Consensus demands communication.

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

Adults are naturally most conscious of directing the conduct of others when they are immediately aiming so to do. As a rule, they have such an aim consciously when they find themselves resisted; when others are doing things they do not wish them to do. But the more permanent and influential modes of control are those which operate from moment to moment continuously without such deliberate intention on our part.

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

Without initiation into the scientific spirit one is not in possession of the best tools which humanity has so far devised for effectively directed reflection. One in that case not merely conducts inquiry and learning without the use of the best instruments, but fails to understand the full meaning of knowledge.