BROWNE, Alexander, Ars Pictoria : or an Academy Treating of Drawing, Painting, Limning, Etching. To which are Added XXXI. Copper Plates, Expressing the Choicest, Nearest, and Most Exact Grounds and Rules of Symmetry. Collected out of the most Eminent Italian, German, and Netherland Authors. By Alexander Browne, Practitioner in the Art of Limning. The Second Edition, Corrected and Enlarged by the Author, London, Arthur Tooker - William Battersby, 1675.1 quotations
Of the Vertue of Light.
Light hath so great force in Pictures, that (in my judgement) therein consisteth the whole grace thereof, if it be well understood, an contrarywife, the disgrace if it be not perceived, and evident example whereof we may see in a Body proportionably drawn which being yet without the lights, sheweth very beautifull, so far forth as it is wrought, but if afterwards it shall be shadowed without judgement and art, so that the shadowes be confusedly placed where the lights ought to be, and contrarywise the lights where the Middle of the shadows should be, and the concavities and convexities disorderly suited, without any Imitation of Nature it were better it had never been either drawn or lightned, whereas having lights well disposed, it doth not only add perfection to the draught but so sets it off from the Flat that it seems to be imbossed.
And in this vertue and power consisteth the chiefest excellency of the Painter […].