[592] Kriton feels this difficulty in Euthud. 306 D, E.
[593] Plato, Phaedr. 275 A.
[594] Ibid. 275 E.
[595] Plato, Phaedr. 275 D; Theait. 164; Protag. 329 A, and 347 E.
[596] So book-knowledge is a hothouse plant which has sprung up unnaturally all in a moment, and very delicate when exposed to the open air of criticism (Phaedr. 276-7).
[597] Plato, Sophist, 230 A.
[598] Plato, Menon, 97; Rep. 534 B, C.
[599] Plato, Rep. 518.
[600] Plato, Phaidr. 277 A.
[601] Plato, Phaidr. 276 D, E.