One interpretation of Ambrose’s writings is that he was a Christian Universalist.  Christian Universalism espouses a view of redemption that all human beings and fallen angels will ultimately be restored to a right relationship with God.

Ambrose displayed a kind of liturgical flexibility that kept in mind that liturgy was a tool to serve people in worshiping God, and ought not to become a rigid entity that is invariable from place to place.  His advice has remained in the English language as the saying, “When in Rome, do as the Romans do.“

(Perhaps most importantly, St. Ambrose is the patron of bees and bee keepers.  Oh, Bryan Fuller, we are on to you!)

from here and here and confirmed with other sources.

@mageek-and-mazes added this to the original post on Tumblr:

St-Ambrose was a proponent of the Felix Culpa too, an heresy stating that the fall from grace is a fortunate fall and part of god’s plan from the start. And that humanity loss of innocence will ultimately be better than remaining in the naive bliss of our Edenic beginnings.