Basically it means
Don't get angry when you feel like getting angry
Don't be unpleasant when you feel like being unpleasant
Don't get too close to people. Nor seem too remote
I doubt
That was an age when virtue was discussed and debated not in anti-septic terms
E.g. Speak the truth. Be patient. Exhibit forbearance etc
These virtues were championed as they were regarded as inherently "good" as opposed to expedient traits that enable us to "get along"
The religious dimension to informing us on what's virtuous and what isn't has sort of disappeared
Professionalism is not "positive" virtue in my view. But rather a set of guidelines that seek to remove conflict and discomfort
It stems from the "Enlightenment" and notions of "state of nature" where all virtue arises from an instinct to get along and avoid internecine conflict
But mass culture and popular understanding of virtue was still religiously moored even 2-3 generations ago in my view
Where there is no such thing as a good life. But merely "tactics" to advance in a group setting, without making many enemies
But on doing the "pleasing" thing
What's likely to avoid "confrontation" with your peers / boss / subordinates in the very short term
Preyas over Shreyas - to use terminology from Kathopanishad - an Indian text from 1st millennium BCE