Arithmetic must be discovered in just the same sense in which Columbus discovered the West Indies, and we no more create numbers than he created the Indians.

There is no greater reason for children to honour parents than for parents to honour children except, that while the children are young, the parents are stronger than children.

The three main extra-rational activities in modern life are religion, war, and love. all these are extra-rational, but love is not anti-rational, that is to say, a reasonable man may reasonably rejoice in its existence

Every sane and sensible and quiet thing we do is absolutely ignored by the press.

Philosophy, though unable to tell us with certainty what is the true answer to the doubts which it raises, is able to suggest many possiblities which enlarge our thoughts and free them from the tyranny of custom. Thus, while diminishing our feeling of certainty as to what things are, it greatly increases our knowledge as to what the may be; it removes the somewhat arrogant dogmatism of those who have never travelled into the region of liberating doubt, and it keeps alive our sense of wonder by showing familar things in an unfamilar aspect

Emphatic and reiterated assertion, especially during childhood, produces in most people a belief so firm as to have a hold even over the unconscious.

Insight, untested and unsupported, is an uncertain guarantee of the truth.