The poem was about the second Punic war, and it explained the battles they fought. Instead of basing his poem off of religion, he wrote about Human achievement. He talked about people battering for there lives, and the lives of others. It represents humanism because Petrarch focused on the life of people, not just religion.
The quote is explaining that we live life by loving someone. He also explains that there is a reason to be madly in love. In Petrarch's life, he focuses on love, and the human life style. He wanted people to live there life to the very fullest, and he wanted people to know that it is okay to fall in love.