Saint Ambrose, Latin: Sanctus Ambrosius, "Ambrosius episcopus Mediolanensis"; Italian: Sant'Ambrogio; Lombard: Sant'Ambroeus) (c. 340 – 4 April 397), bishop of Milan (Mediolanum in Latin), was one of the most eminent bishops of the 4th century. Together with Augustine of Hippo, Jerome, and Gregory I, he is counted as one of the four doctors of the West of antique church history.
- Accordingly, death is a harbor of peace for the just, but is believed a shipwreck for the wicked.
- De bono mortis, 8, 31.
- It is not death therefore that is burdensome, but the fear of death.
- De bono mortis, 8, 31.
- It was not by dialectic that it pleased God to save His people.
- De fide, I, 5, 42.
- When I am at Rome, I fast on a Saturday; when I am at Milan, I do not. Follow the custom of the church where you are.
- Quoted in "Epistle to Januarius", II, section 18 and "Epistle to Casualanus", XXXVI, section 32, by St. Augustine
- Si fueris Romae, Romano vivito more;
Si fueris alibi, vivito sicut ibi.
- If you are at Rome, live in the Roman style; if you are elsewhere, live as they live there.
- Quoted in Ductor Dubitantium, or the Rule of Conscience (1660) by Jeremy Taylor, I.i.5; commonly rendered into a proverb: "When in Rome, do as the Romans do", or simply "When in Rome..."
- Neither angel, nor archangel, nor yet even the Lord Himself (who alone can say "I am with you"), can, when we have sinned, release us, unless we bring repentance with us.
- As quoted in Many Thoughts of Many Minds (1896) edited by Louis Klopsch
- Ante agnus offerebatur, offerebatur et vitulus, nunc Christus offertur...et offert se ipse quasi sacerdos, ut peccata nostra dimittat. Hic in imagine, ibi in veritate, ubi apud Patrem pro nobis quasi advocatus intervenit.
- Formerly a lamb was offered, a calf was offered. Christ is offered today...and he offers himself as priest in order that he may remit our sins: here in image, there in truth where, as our advocate, he intercedes for us before the Father.
- De officiis ministrorum ("On the Offices of Ministers" or, "On the Duties of the Clergy"), Book I, ch. 48.
- In, The Eucharist in the West: History and Theology, Edward J. Kilmartin, SJ, Robert J. Daly, SJ, Editor, 1998, The Liturgical Press, ISBN 0814662048 ISBN 9780814662045, p. 19 
- Alternate translation: In old times a lamb, a Calf was offered; now Christ is offered. But He is offered as man and as enduring suffering. And He offers Himself as a priest to take away our sins, here in an image, there in truth, where with the Father He intercedes for us as our Advocate. 
- In some causes silence is dangerous; so if any know of conspiracies against their country or king, or any that might greatly prejudice their neighbor, they ought to discover it.
- The emperor is in the Church, not above the Church.