Nicene and Post-Nicene Fathers, Ser. II, Vol. III:
Life and Works of Rufinus with Jerome's Apology Against Rufinus.: A story of Origen.

17. Once more, in his letter to Marcella he says: 2965

“Ambrose, who supplied the paper, the money and the secretaries by the aid of which our Adamantius 2966 and Chalcenterus 2967 completed his innumerable books, in a certain letter written to the same person from Athens, declares that he never had a meal, when Origen was present, without something being read, and that he never went to bed without having some brother read aloud from the holy Scriptures. This he said he continued day and night, so that prayer waited upon reading and reading upon prayer.”

Footnotes

Letter xliii, 1.

Indomitable or made of adamant.

Indefatigable; lit. Brazen-bowelled.