v.13a — Condition: service carried out well
Those who have served as deacons and done so well are in view (commendable performance rather than merely holding a role).
v.13b — Result 1: "good standing"
They acquire for themselves a good standing—an improved regard or recognized status that follows demonstrated trustworthiness.
v.13c — Result 2: great boldness connected to the faith
They also gain great boldness, described as being "in the faith that is in Christ Jesus," tying their confidence to their allegiance and identity within that confession.