To enjoy - to love a thing for its own sake and for no other reason.

The function of muscle is to pull and not to push, except in the case of the genitals and the tongue.

If you find from your own experience that something is a fact and it contradicts what some authority has written down, then you must abandon the authority and base your reasoning on your own findings.

Make yourself a master of perspective, then acquire perfect knowledge of the proportions of men and other animals.

He who thinks little errs much.

Every now and then go away, have a little relaxation, for when you come back to your work your judgment will be surer. Go some distance away because then the work appears smaller and more of it can be taken in at a glance and a lack of harmony and proportion is more readily seen.

The lover is moved by the beloved object as the senses are by sensual objects; and they unite and become one and the same thing. The work is the first thing born of this union; if the thing loved is base the lover becomes base.