Bishop Byrnes’ coat of arms is divided into three sections that include symbols of his family history and his educational attainment prior to joining the seminary.
Three right hands displayed across the top of the shield are representative of Byrnes’ descendants in Ireland.
In the bottom two sections a white pine tree denotes his birth in the state of Michigan. A microscope represents his education and work in microbiology prior to enrolling at Sacred Heart Major Seminary in 1990.
The number of tassels draped alongside the shield, six, is representative of Byrnes’ rank as a bishop.
Byrnes’ motto—Caritas Christi urget nos—is from St. Paul’s second letter to the Corinthians. In Latin, it proclaims, “for the love of Christ urges us on, because we are convinced that one [Christ Jesus] has died for all.”