De Somniis (lib. i-ii)

But if they are restive and obstinate for ever, and indulge in wanton behaviour, as if they were independent, and free, and the rulers of others, then by a necessity which is deaf to all entreaties and implacable, they will learn to feel their own nothingness in all things both small and great;

for the driver who mounts upon them, putting a bridle, upon this world, as though it were a winged chariot, drawing back with main strength the reins which before were loose, and pressing the bits severely, will remind them by whip and spur of his authority as master, which they, like wicked servants, have forgotten by reason of the gentle and merciful temper of their manager;