How we cite our quotes: (Line)
Quote #4
O noble Latin blood,
release yourself from such a harmful burden,
and do not idolize
a name that is so empty (74-77)
Petrarch is really pushing the nobility to understand their civic duty to the people of their lands. For one thing, they've got the noble lineage (i.e., ancient Rome) that should allow them to make good decisions on behalf of the people. For another, they should be sensible enough not to make war over something that isn't for the benefit of society at large.
Quote #5
In God's name may your mind
for once be moved by this, and look with pity
upon the tears of all your grieving people (87-89)
A good prince, Petrarch implies, would listen to the pleas of his people. If he can't act out of love for his people, he needs to go back to nobility school.
Quote #6
[...] and all the time you spend
in giving others pain, to some more worthy act
of hand of intellect
to some beautiful praise,
to worthy dedication be converted (106-111)
Here's a thought: if Fortune favors you to be born part of the ruling class, you should probably act like a noble person. Petrarch wants to slap the nobility upside the head for their (self) destructive behaviors and urges them to turn their minds to something more productive and optimistic.