Darwin has interested us in the history of nature's technology.

All science would be superfluous if the outward appearance and the essence of things directly coincided.

There is no greater stupidity than for people...to marry and so surrender themselves to the small miseries of domestic and private life.

The weapon of criticism can never replace the criticism of weapons.

There is no royal road to science, and only those who do not dread the fatiguing climb of its steep paths have a chance of gaining its luminous summits. (Preface to the French edition).

The production of too many useful things results in too many useless people.

Society is undergoing a silent revolution, which must be submitted to, and which takes no more notice of the human existences it breaks down than an earthquake regards the houses it subverts. The classes and the races, too weak to master the new conditions of life, must give way.