3 When I considered the immense and unprecedented numbers of you who are here gathered together, and the gifts of divine grace which have shone forth in the holy martyrs, I must confess that I felt myself unequal to this task, and that I could not express in words what we can scarcely conceive in our minds or take in with our eyes. But when the course of holy Scripture began to be read, the Holy Spirit Who spoke in the prophets granted me to utter something worthy of so great a gathering, of your expectations, and of the merits of the holy martyrs.
Source: Letters (New Advent)