The Republic by Plato
The Republic by Plato Those then who know not wisdom and virtue, and are always busy with gluttony and sensuality, go down and up again as far as the mean; and in this region they move at random throughout life, but they never pass into the true upper world; thither they neither look, nor do they ever find their way, neither are they truly filled with true being, nor do they taste of pure and abiding pleasure. Like cattle, with their eyes always looking down and their heads stooping to the earth, that is, to the dining-table, they fatten and feed and breed, and, in their excessive love of these delights, they kick and butt at one another with horns and hoofs which are made of iron; and they kill one another by reason of their insatiable lust. For they fill themselves with that which is not substantial, and the part of themselves which they fill is also unsubstantial and incontinent.
Verily, Socrates, said Glaucon, you describe the life of the many like an oracle.
Their pleasures are mixed with pains—how can they be otherwise? For they are mere shadows and pictures of the true, and are coloured by contrast, which exaggerates both light and shade, and so they implant in the minds of fools insane desires of themselves; and they are fought about as Stesichorus says that the Greeks fought about the shadow of Helen at Troy in ignorance of the truth.
Something of that sort must inevitably happen.