>>12366799Because they fail to excite an eros for ideas, they don't move the mind upwards to contemplate the eternal forms, their rhetoric is stationary and dead. See Socrates dialogue with Phadreus after the second speech, and Diotima's speech in the Symposium.
You're experience of intelligence is an erotic awe for ideas. If the ideas are not expressed with eroticism, then you will not experience awe at them. All good expression needs a poetic touch that understands the eroticism that drives human thinking and striving. In pop-sci people like Sagan understood this so well they're still treated as gods decades after their death, the eros for ideas created a movement in minds that outlived his physical body.