[159e]
Socrates
Therefore the union of the Socrates who is ill and the draught of wine produces other results: in the tongue the sensation or perception of bitterness, and in the wine—a bitterness which is engendered there and passes over into the other; the wine is made, not bitterness, but bitter, and I am made, not perception, but perceptive.
Theaetetus
Certainly.
Socrates
Then I shall never have this perception of any other thing; for a perception of another thing is another perception,