Represent your figures in such action as may be fitted to express what purpose is in the mind of each; otherwise your art will not be admirable. - Leonardo da Vinci

To manage the large mould make a model of the small mould, make a small room in proportion.

Many will think they may reasonably blame me by alleging that my proofs are opposed to the authority of certain men held in the highest reverence by their inexperienced judgments; not considering that my works are the issue of pure and simple experience, who is the one true mistress. These rules are sufficient to enable you to know the true from the false — and this aids men to look only for things that are possible and with due moderation — and not to wrap yourself in ignorance, a thing which can have no good result, so that in despair you would give yourself up to melancholy.

He who does not oppose evil......commands it to be done.