SOCRATES: The combination of the draught of wine, and the Socrates who is
sick, produces quite another result; which is the sensation of bitterness
in the tongue, and the motion and creation of bitterness in and about the
wine, which becomes not bitterness but something bitter; as I myself become
not perception but percipient?

THEAETETUS: True.

SOCRATES: There is no other object of which I shall ever have the same
perception, for another object would give another perception, and would
make the percipient other and different; nor can that object which affects
me, meeting another subject, produce the same, or become similar, for that
too would produce another result from another subject, and become
different.

THEAETETUS: True.

SOCRATES: Neither can I by myself, have this sensation, nor the object by
itself, this quality.

THEAETETUS: Certainly not.

SOCRATES: When I perceive I must become percipient of something--there can
be no such thing as perceiving and perceiving nothing; the object, whether
it become sweet, bitter, or of any other quality, must have relation to a
percipient; nothing can become sweet which is sweet to no one.

THEAETETUS: Certainly not.