"This explains why, in those who are strongly moved owing to passion, or time of life, no memory is formed; just as no impression would be formed if the movement of the seal were to impinge on running water; while there are others in whom, owing to the receiving surface being frayed, as happens to old walls, or owing to the hardness of the receiving surface, the requisite impression is not implanted at all."
— Aristotle (384-322 B.C.)
(450a26-450b10 p. 715 in Oxford Translation)
Reading in Aristotle, Introduction to Aristotle, trans. R. McKeon. (Chicago and London: The University of Chicago Press, 1973).