A good memory, which nature has endowed us with, causes things long past to seem present.
All our knowledge has its origins in our perceptions.
Learning never exhausts the mind.
The eye - which sees all objects reversed - retains the images for some time.
Though I may not . . . be able to quote other authors, I shall rely on that which is much greater and more worthy - on experience.
The eye transmits its own image through the air to all the objects which face it, and also receives them on its own surface, whence the "sensus communis" takes them and considers them.