WIST

They do greatly err who acknowledge that the flesh of man was taken on Himself by Christ, but deny that the affections of man were taken; and they contravene the purpose of the Lord Jesus Himself, since thus they take away from man what constitutes man, for man cannot be man without human affections.

St. Ambrose (339-397) Roman prelate, Bishop of Milan [Aurelius Ambrosius]
“On Psalm 61″

It is not death therefore that is burdensome, but the fear of death.

St. Ambrose (339-397) Roman prelate, Bishop of Milan [Aurelius Ambrosius]
De bono mortis, 8, 31

No duty is more urgent than returning thanks.

St. Ambrose (339-397) Roman prelate, Bishop of Milan [Aurelius Ambrosius]
De excessu fratris Satyri [On the Passing of His Brother Satyrus], Book I, ch. 44

When I am in Rome, I fast as the Romans do; when I am at Milan, I do not fast. So likewise you, whatever church you come to, observe the custom of the place.
[Cum Romanum venio, ieiuno Sabbato; cum hic sum, non ieiuno: sic etiam tu, ad quam forte ecclesiam veneris, eius morem serva, si cuiquam non vis esse scandalum nec quemquam tibi.]

St. Ambrose (339-397) Roman prelate, Bishop of Milan [Aurelius Ambrosius]
In Augustine, Epistulae, XXXVI (c. AD 400)
Alt trans.: "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." Alt trans.: "When I am here, I do not fast on the Sabbath; when I am in Rome, I fast on the Sabbath." Various Augustine citations described: - Epistulae XXXVI, 14 or 32 - Letter 54 to Januarius - Epistle to Januarius, II, sec. 18 - Epistle to Casualanus, XXXVI, sec. 32 Alternately given as "If you are at Rome, live in the Roman style; if you are elsewhere, live as they live there. [Si fueris Romae, Romano vivito more; / Si fueris alibi, vivito sicut ibi.]" in J. Taylor, Ductor Dubitantium, or the Rule of Conscience, I.i.5 (1660). Popularly, "When in Rome, do as the Romans do."