But to me all sciences seem vain and full of error that are not born of experience, mother of all certainty, and do not terminate in an actual experience.

Small rooms or dwellings discipline the mind, large ones weaken it.

The noblest pleasure is the joy of understanding.

Man has much power of discourse which for the most part is vain and false; animals have but little, but it is useful and true, and a small truth is better than a great lie.

A good memory, which nature has endowed us with, causes things long past to seem present.

I say that the power of vision extends through the visual rays to the surface of non-transparent bodies, while the power possessed by these bodies extends to the power of vision.

Where there is most feeling, there is the greatest martyrdom.