The question is not so much whether there is life on Mars as whether it will continue to be possible to live on Earth

Nature, when left to universal laws, tends to produce regularity out of chaos.

All false art, all vain wisdom, lasts its time but finally destroys itself, and its highest culture is also the epoch of its decay.

It is often necessary to make a decision on the basis of knowledge sufficient for action but insufficient to satisfy the intellect.

It is precisely in knowing its limits that philosophy consists.

We come no nearer the infinitude of the creative power of God, if we enclose the space of its revelation within a sphere described with the radius of the Milky Way, than if we were to limit it to a ball an inch in diameter. All that is finite, whatever has limits and a definite relation to unity, is equally far removed from the infinite... Eternity is not sufficient to embrace the manifestations of the Supreme Being, if it is not combined with the infinitude of space.

If man makes himself a worm he must not complain when he is trodden on.