Fides Et Ratio

Without humility it is impossible to be a grateful person. Rather, we even look to God as if He owes us. To the prideful, God owes us everything good, and therefore we are not grateful but entitled. When we realize that God owes us nothing, yet chooses to give us Heaven anyways, then our heart cheers with gratitude. Naaman is a concrete example of this. He began with pride, but ended His journey in thanksgiving to the One true God.