Sayings of Socrates 8

The inexperienced in wisdom and virtue, ever occupied with feasting and such, are carried downward, and there, as is fitting, they wander their whole life long, neither ever looking upward to the truth above them, nor rising toward it, nor tasting pure and lasting pleasures. 

Like cattle, always looking downward with their heads bent toward the ground and the banquet tables, they feed, fatten, and fornicate. 

In order to increase their possessions they kick and butt with horns and hoofs of steel and kill each other, insatiable as they are. 

—Plato, Republic IX, 586a-b