Sokrates then compares the oration of Lysias with his own two orations (the first depreciating, the second extolling, Eros) in the point of view of art; to see how far they are artistically constructed. Among the matters of discourse, there are some on which all men are agreed, and on which therefore the speaker may assume established unanimity in his audience: there are others on which great dissension and discord prevail. Among the latter (the topics of dissension), questions about just and unjust, good and evil, stand foremost:[65] it is upon these that deception is most easy, and rhetorical skill most efficacious. Accordingly, an orator should begin by understanding to which of these two categories the topic which he handles belongs: If it belongs to the second category (those liable to dissension) he ought, at the outset, to define what he himself means by it, and what he intends the audience to understand. Now Eros is a topic on which great dissension prevails. It ought therefore to have been defined at the commencement of the discourse. This Sokrates in his discourse has done: but Lysias has omitted to do it, and has assumed Eros to be obviously and unanimously apprehended by every one. Besides, the successive points in the discourse of Lysias do not hang together by any thread of necessary connection, as they ought to do, if the discourse were put together according to rule.[66] [Footnote 65: Plato, Phædrus, p. 263 B. Compare Plato, Alkibiad. i. p. 109.] [Footnote 66: Plato, Phædrus, pp. 263-265.] [Side-note: Logical processes--Definition and Division--both of them exemplified in the two discourses of Sokrates.]