All our knowledge has its origins in our perceptions.

Truth at last cannot be hidden. Dissimulation is of no avail. Dissimulation is to no purpose before so great a judge. Falsehood puts on a mask. Nothing is hidden under the sun.

There are many occasions when the muscles that form the lips of the mouth move the lateral muscles that are joined to them, and there are an equal number of occasions when these lateral muscles move the lips of this mouth, replacing it where it cannot return of itself, because the function of muscle is to pull and not to push except in the case of the genitals and the tongue.

Love, Fear, and Esteem, - Write these on three stones.

When counting, try not to mix chickens with blessings.

The eye is the window of the human body through which it feels its way and enjoys the beauty of the world.

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