In attempting to understand the elements out of which mental phenomena are compounded, it is of the greatest importance to remember that from the protozoa to man there is nowhere a very wide gap either in structure or in behaviour. From this fact it is a highly probable inference that there is also nowhere a very wide mental gap.

The reason is, and by rights ought to be, slave to the emotions.

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

A proverb is one man's wit and all men's wisdom.

Conquer the world by intelligence, and not merely by being slavishly subdued by the terror that comes from it.

A million million years gives us some time to prepare for the end . . . let us make the best of it.

The Ten Commandments should be headed like an examination paper: No more than six to be attempted.