Fire destroys falsehood, that is sophistry, and restores truth, driving out darkness.

Just as iron rusts from disuse... even so does inaction spoil the intellect.

Lying on a feather mattress or quilt will not bring you renown.

Instrumental or mechanical science is the noblest and above all others, the most useful.

No human investigation can claim to be scientific if it doesn't pass the test of mathematical proof.

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.

In rivers, the water that you touch is the last of what has passed and the first of that which comes; so with present time.