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

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.

The idea of protoplasm, which was really a name for our ignorance, [is] only a little less misleading than the expression "Vital force".

So far from being an isolated phenomenon the late war is only an example of the disruptive result that we may constantly expect from the progress of science.

In fact, words are well adapted for description and the arousing of emotion, but for many kinds of precise thought other symbols are much better.

There are 400,000 species of beetles on this planet, but only 8,000 species of mammals.

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