Pain itself is pain, but occasionally it arises due to some great pleasure. To pursue it, one must toil and undergo hardship. To be sure, no one rejects, dislikes, or avoids pleasure itself because it is pleasure, but because great pains can result from those pleasures. Similarly, to avoid pain is reasonable, but occasionally circumstances occur in which toil and pain can procure some great pleasure for the future. No one ever takes part in laborious exercises unless prompted by some good reason.