Hoyt & Roberts, comps. Hoyt’s New Cyclopedia of Practical Quotations. 1922.

Perception

As men of inward light are wont
To turn their optics in upon’t.
Butler—Hudibras. Pt. III. Canto I. L. 481.

He gives us the very quintessence of perception.
Lowell—My Study Window. Coleridge.