Ambrose of Milan's Expositio in Psalmum CXVIII is his longest single work — a sermon-by-sermon meditation on the great alphabetic psalm, structured by the twenty-two letters of the Hebrew alphabet. This edition presents the Latin and a fresh English translation on facing pages, following the critical text of CSEL 62.
The print edition is a 513-page, 6×9 paperback. A free digital reading edition, with the same text and apparatus, is hosted online.