Why does the poem consider the faiths of old his daily bread?

The poem titled "Sonnet 29" was written by George Santayana. The poem speaks of the poet's bad luck and how envious he is of people who are more successful than him. He considers the "faiths of old" to be his "daily bread" because the old faiths or beliefs have the ability to save him. The tenth line in the poem explains this and I quote: "I bless their hope, I bless their will to save". The poet believes that the old faiths have hope and they want to save him.