29 So, then, our harvest is the faith of souls; the grace of the Church is the vintage of merits, which from the beginning of the world flourished in the Saints, but in the last age has spread itself over the people, that all might notice that the faith of Christ has entered minds which were not rude (for there is no crown of victory without an adversary), but the opinion being exploded which before prevailed, that which was true is rightly preferred.
Source: Letters (New Advent)