Full Idea
If you should not argue in metaphors, it is plain too that you should neither define by metaphors nor define what is said in metaphors; for then you will necessarily argue in metaphors.
Gist of Idea
If you shouldn't argue in metaphors, then you shouldn't try to define them either
Source
Aristotle (Posterior Analytics [c.327 BCE], 97b37)
Book Reference
Aristotle: 'Posterior Analytics (2nd ed)', ed/tr. Barnes,Jonathan [OUP 1993], p.68
A Reaction
Impeccable logic, but seeing a similarity can be a wonderful shortcut to seeing a great truth.