Name the coworker who drives you nuts in your prayers. Resentment shrinks when you keep asking God to bless someone.

Resentment runs on repetition, and so does its cure. Bringing somebody up once changes very little, which is why most people try it, feel nothing, and conclude it does not work. Doing it daily for a few weeks is different. It is hard to maintain a grudge against a name you keep asking for good things on behalf of, because the version of them in your head gradually stops being a cartoon.

Name the person at work who grates on you, out loud, every shift for a fortnight. Specific name, specific good thing.