The Book of the science of Mechanics must precede the Book of useful inventions.
The good painter must paint two things: a person and the essence of his soul.
My body will not be a tomb for other creatures.
Nothing strengthens authority so much as silence.
He who wishes to see how the soul inhabits the body should look to see how that body uses its daily surroundings. If the dwelling is dirty and neglected, the body will be kept by its soul in the same condition, dirty and neglected.
Details make perfection, and perfection is not a detail.