Never did I think so much, exist so much, be myself so much as in the journeys I have made alone and on foot. Walking has something about it which animates and enlivens my ideas. I can hardly think while I am still; my body must be in motion to move my mind.

Sovereigns always see with pleasure a taste for the arts of amusement and superfluity, which do not result in the exportation of bullion, increase among their subjects. They very well know that, besides nourishing that littleness of mind which is proper to slavery, the increase of artificial wants only binds so many more chains upon the people.

Not all the subtilties of metaphysics can make me doubt a moment of the immortality of the soul, and of a beneficent Providence. I feel it, I believe it, I desire it, I hope it, and will defend it to my last breath.

Teach him to live rather than to avoid death: life is not breath, but action, the use of our senses, our mind, our faculties, every part of ourselves which makes us conscious of our being. Life consists less in length of days than in the keen sense of living. A man maybe buried at a hundred and may never have lived at all. He would have fared better had he died young.

Chemistry... is like the maid occupied with daily civilisation; she is busy with fertilisers, medicines, glass, insecticides ... for she dispenses the recipes.

Free people, remember this maxim: we may acquire liberty, but it is never recovered if it is once lost.

Behold the works of our philosophers; with all their pompous diction, how mean and contemptible they are by comparison with the Scriptures! Is it possible that a book at once so simple and sublime should be merely the work of man?