Philosophy is such an impertinently litigious lady that a man had as good be engaged in lawsuits as have to do with her.
Isaac NewtonFrom what has been said it is also evident, that the Whiteness of the Sun's Light is compounded all the Colours wherewith the several sorts of Rays whereof that Light consists, when by their several Refrangibilities they are separated from one another, do tinge Paper or any other white Body whereon they fall. For those Colours ... are unchangeable, and whenever all those Rays with those their Colours are mix'd again, they reproduce the same white Light as before.
Isaac NewtonPictures, propagated by motion along the fibers of the optic nerves in the brain, are the cause of vision.
Isaac Newton