"What man with a human heart, who has ever cared for domestic animals, could look into their eyes, so full of confidence and affection, and willingly give them over to the butcher's knife? How could he devour their flesh as a sweet morsel?"

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Memory is therefore, neither Perception nor Conception, but a state or affection of one of these, conditioned by lapse of time. As already observed, there is no such thing as memory of the present while present, for the present is object only of perception, and the future, of expectation, but the object of memory is the past. All memory, therefore, implies a time elapsed; consequently only those animals which perceive time remember, and the organ whereby they perceive time is also that whereby they remember.

— Aristotle