The Republic - pg. 291

"But if not, my dear comrade, just like the men who have
once fallen in love with someone, and don't believe the love
is beneficial, keep away from it even if they have to do violence
to themselves; so we too - due to the inborn love of such
poetry we owe to our rearing in these fine regimes - we'll
be glad if it turns out that it is best and truest. But as long
as it's not able to make its apology, when we listen to it, we'll
chant this argument we are making to ourselves as a countercharm,
taking care against falling back again into this love, which is childish
and blongs to the many. We are, at all events, aware that such poetry
mustn't be taken seriously as a serious thing laying hold of truth, but
that the man who hears it must be careful, fearing for the regime in
himself, and must hold what we have said about poetry."