In order to give this Just Representation of Nature […] I say in order to follow Nature exactly, a Man must be well acquainted with Nature, and have a reasonable Knowledge of Geometry, Proportion, (which must be varied according to the Sex, Age, and Quality of the Person) Anatomy, Osteology, and Perspective. I will add to these an Acquaintance with the Works of the best Painters, and Sculptors, Ancient, and Modern : For ‘tis a certain Maxim, No Man sees what things Are, that knows not what they Ought to be.
That this Maxim is true, will appear by an Academy Figure drawn by one ignorant in the Structure, and knitting of the Bones, and Anatomy, compar’d with another who understands these throughly :