"What next? Is there also something of this kind in them; for instance, between all two contraries a mutual twofold production, from one to the other, and from that other back again? for between a greater thing and a smaller there are increase and decrease, and do we not accordingly call the one to increase, the other to decrease?"
"Yes," he replied.
[43]. "And must not to be separated and commingled, to grow cold and to grow warm, and every thing in the same manner, even though sometimes we have not names to designate them, yet in fact be everywhere thus circumstanced, of necessity, as to be produced from each other, and be subject to a reciprocal generation?"
"Certainly," he replied.
"What, then?" said Socrates, "has life any contrary, as waking has its contrary, sleeping?"
"Certainly," he answered.
"What?"
"Death," he replied.
"Are not these, then, produced from each other, since they are contraries; and are not the modes by which they are produced two-fold intervening between these two?"
"How should it be otherwise?"