There is time for humility and humbleness, and there is time for

There is time for humility and humbleness, and there is time for poise and confidence

Ideally, one is always poised and commanding as befits one's position/status.  If one can manage to be that, s/he has no difficulty to:

1) Be assertive, but not arrogant;

2) Be confident, but not boastful;

3) Be self-assured, but not self-righteous; and

4) Be humble and modest, but not timid or self-doubting.

Failing the above, one can always reliably fall back on this ageless wisdom: There is time for humility and humbleness, and there is time for pride and confidence.  Take your pick and make the most of either setting.