Now apply this to the case of cognition. The Form of Cognition correlates exclusively with the Form of Truth: the Form of each special Cognition, geometrical or medical, or other, correlates with the Form of Geometry or Medicine. But Cognition as we possess it, correlates only with Truth relatively to us: also, each special Cognition of ours has its special correlating Truth, relatively to us.[19] Now the Forms are not in or with us, but apart from us: the Form of Cognition is not our Cognition, the Form of Truth is not our Truth. Forms can be known only through the Form of Cognition, which _we_ do not possess: we cannot therefore know Forms. We have our own cognition, whereby we know what is relative to us; but we know nothing more. Forms, which are not relative to us, lie out of our knowledge. _Bonum per se, Pulchrum per se_, and the other self-existent Forms or Ideas, are to us altogether unknowable.[20] [Footnote 19: Plato, Parmenid. p. 134 A. [Greek: Ou)kou=n kai\ e)pistê/mê, au)tê\ me\n o(\ e)/stin e)pistê/mê, tê=s o(\ e)/stin a)lê/theia, au)tê=s a)\n e)kei/nês ei)/ê e)pistê/mê? . . . Ê( de\ par' ê(mi=n e)pistê/mê ou) tê=s par' ê(mi=n a)\n a)lêthei/as ei)/ê? kai\ au)= e(ka/stê ê( par' ê(mi=n e)pistê/mê tô=n par' ê(mi=n o)/ntôn e(ka/stou a)\n e)pistê/mê su/mbainoi ei)=nai?] Aristotle (Topica, vi. p. 147, a. 6) adverts to this as an argument against the theory of Ideas, but without alluding to the Parmenides; indeed he puts the argument in a different way--[Greek: to\ d' ei)=dos pro\s to\ ei)=dos dokei= le/gesthai, oi(=on au)tê\ e)pithumi/a au)tou= ê(de/os, kai\ au)tê\ bou/lêsis au)tou= a)gathou=.] Aristotle argues that there is no place in this doctrine for the [Greek: phaino/menon a)gatho/n], which nevertheless men often wish for, and he remarks, in the Nikom. Ethica, i. 4, 1096 b. 33--that the [Greek: au)to\-a)gatho\n] is neither [Greek: prakto\n] nor [Greek: ktêto\n a)nthrô/pô|].] [Footnote 20: Plato, Parmenid. p. 134 C. [Greek: A)/gnôston a)/ra ê(mi=n kai\ au)to\ to\ kalo\n o(\ e)/sti, kai\ to\ a)gatho/n, kai\ pa/nta a(\ dê\ ô(s i)de/as au)ta\s ou)/sas u(polamba/nomen.]] [Side-note: Form of cognition, superior to our Cognition, belongs to the Gods. We cannot know them, nor can they know us.]