Mental states of every kind — sensations, feelings, images— which were at one time present in consciousness and then have disappeared from it — have not with their disappearance absolutely ceased to exist. Although the inwardly - turned look may no longer be able to find them, nevertheless they have not been utterly destroyed and annulled, but in a certain manner they, continue to exist, stored up to speak, in the memory.

p. 1; Cited in: Richard F. Thompson, Stephen A. Madigan (2013) Memory: The Key to Consciousness, p. 87 - Memory: A contribution to experimental psychology, 1885