Men have had the vanity to pretend that the whole creation was made for them, while in reality the whole creation does not suspect their existence..

There are men who would be afraid to commit themselves on the doctrine that castor oil is a laxative..

The universe is so immense that it appears immutable, and that the duration of a planet such as that of the earth is only a chapter, less than that, ….

What intelligent being, what being capable of responding emotionally to a beautiful sight, can look at the jagged, silvery lunar crescent trembling i….

Lightning seems a thought, which instead of being attached to a brain, is attached to an electric current..

The supernatural does not exist..

What, then, is this blue sky, which certainly does exist, and which veils from us the stars during the day?.

That hemisphere of the moon which faces us is better known than the earth itself; its vast desert plains have been surveyed to within a few acres; it….

Le Verrier-without leaving his study, without even looking at the sky-had found the unknown planet [Neptune] solely by mathematical calculation, and,….

If the existence of human beings leads to nothing, what is all this comedy about?.

Nature is so varied in its modes of action, so multiple in the manisftations of its power, that we have no night to set any limits to its capabilitie….

It is in the name of Jesus, himself become God, that fanaticism ignominiously condemned to the stake men like Giodano Bruno, Vanini, Étienne Dolet, J….

Lightning is like an elementary spirit, eccentric or rational, clever or silly, passing from one extreme to the other..

If humankind - from humble farmers in the fields and toiling workers in the cities to teachers, people of independent means, those who have reached t….

May we attribute to the color of the herbage and plants, which no doubt clothe the plains of Mars, the characteristic hue of that planet, which is no….

The present inhabitation of Mars be a race superior to ours is very probable..