Cosmas Indicopleustes, on Heb 12:11

“Now all chastisement for the present indeed seemeth not to bring with it joy, but sorrow: but afterwards it will yield, to them that are exercised by it, the most peaceable fruit of justice.”

“All discipline, seemeth for the present to be not joyous but grievous; for without discipline and suffering it is impossible there can be learning. For the purpose of discipline therefore, He made this world mortal and mutable and diversified, in order that by the affliction of learning and the variety of the universe, we may, by this experience, ascend to the knowledge of God.”

Imported from an open dataset — not yet checked against the printed edition.