Letters 122.5

You ask me how this depravity comes upon the soul—this habit of reversing the daylight and giving over one’s whole existence to the night? All vices rebel against Nature; they all abandon the appointed order. It is the motto of luxury to enjoy what is unusual, and not only to depart from that which is right, but to leave it as far behind as possible, and finally even take a stand in opposition thereto.

Seneca, Letters to Lucilius 122.5, translated by Richard Mott Gummere