You can drop a mouse down a thousand-yard mine shaft and, on arriving at the bottom, it gets a slight shock and walks away. A rat would probably be killed, though it can fall safely from the eleventh story of a building, a man is broken, a horse splashes.

If materialism is true, it seems to me that we cannot know that it is true. If my opinions are the result of the chemical processes going on in my brain, they are determined by the laws of chemistry, not those of logic.

The conservative has but little to fear from the man whose reason is the servant of his passions, but let him beware of him in whom reason has become the greatest and most terrible of the passions. These are the wreckers of outworn empires and civilisations, doubters, disintegrators, deicides.

It was a reaction from the old idea of "protoplasm", a name which was a mere repository of ignorance.

An ounce of algebra is worth a ton of verbal argument.

I will give up my belief in evolution if someone finds a fossil rabbit in the Precambrian.

The extreme socialists desire to run every nation as a single business concern.