How we cite our quotes:
Good, he who keeps faith, nor too quickly his grief
from his breast makes known, except he, noble, knows how beforehand
to do cure with courage.
With these lines, the speaker returns to the idea that it's better not too reveal one's sorrow in speech. This time, however, there's an exception to the rule: if the grief-stricken person knows how to "do cure," to make his sadness go away, it's OK for him to speak about his grief.