Letters 122.4

Birds that are being prepared for the banquet, that they may be easily fattened through lack of exercise, are kept in darkness; and similarly, if men vegetate without physical activity, their idle bodies are overwhelmed with flesh, and in their self-satisfied retirement the fat of indolence grows upon them. Moreover, the bodies of those who have sworn allegiance to the hours of darkness have a loathsome appearance. Their complexions are more alarming than those of anaemic invalids; they are lackadaisical and flabby with dropsy; though still alive, they are already carrion. But this, to my thinking, would be among the least of their evils. How much more darkness there is in their souls! Such a man is internally dazed; his vision is darkened; he envies the blind. And what man ever had eyes for the purpose of seeing in the dark?

Seneca, Letters to Lucilius 122.4, translated by Richard Mott Gummere