Cattāri Brahmavihārā

“Now there are two kinds of [Stoic] training, one which is appropriate for the soul alone, and the other which is common to both soul and body.

We use the training common to both when we discipline ourselves to cold, heat, thirst, hunger, meager rations, hard beds, avoidance of pleasures, and patience under suffering.

For by these things and others like them the body is strengthened and becomes capable of enduring hardship, sturdy and ready for any task; the soul too is strengthened since it is trained for courage by patience under hardship and for self-control by abstinence from pleasures.”

Musonius Rufus, Lectures, 6