As soon as existence collects itself together and commits itself in some line of conduct, it falls beneath perception. Like every other perception, this one asserts more things than it grasps: when I say that I see the ash-tray over there, I suppose as completed an unfolding of experience which could go on ad infinitum, and I commit a whole perceptual future. Similarly, when I say I know and like someone, I aim, beyond his qualities, at an inexhaustible ground which may one day shatter the image that I have formed of him. This is the price for there being things and ‘other people’ for us, not as the result of some illusion, but as the result of a violent act which is perception itself.
Maurice Merleau-Ponty, Phenomenology of Perception, (Routledge Classics Reprint, p. 421).