I think, however, that so long as our present economic and national systems continue, scientific research has little to fear.

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.

I do not believe in the commercial possibility of induced radioactivity.

The wise man regulates his conduct by the theories both of religion and science. But he regards these theories not as statements of ultimate fact but as art-forms.

A time will however come (as I believe) when physiology will invade and destroy mathematical physics, as the latter has destroyed geometry.

The advance of scientific knowledge does not seem to make either our universe or our inner life in it any less mysterious.

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