"Modern Philosophers, as well as the Peripatetics and Epicureans of old, have conceived, that external objects cannot be the immediate objects of our thought; that there must be some image of them in the mind itself, in which, as in a mirror, they are seen."
— Reid, Thomas (1710-1796)
See Thomas Reid, Essays on the Intellectual Powers of Man (Edinburgh and London: Printed for John Bell, and G.G.J. & J. Robinson, 1785). <Link to Google Books>