4. Further, the Divine Word also asserts that what is said, although it be in itself true and most persuasive, is not of itself sufficient to reach man's soul, unless a certain power from God be given to the speaker and grace be shed over his words, and effective speakers cannot have this grace without God's help. At all events, the Prophet says in the 67th Psalm that "the Lord shall give a word to them that publish the tidings with great power." Granting, then, that in some cases the Greeks have the same doctrines as ours, it by no means follows that even the same doctrines avail for winning souls and disposing them accordingly. Hence it is that the disciples of Jesus, unlearned and ignorant men as regards Greek philosophy, compassed many nations of the world, impressing each individual hearer as the Word desired, according to his deserts; for the hearers profited in proportion as their will inclined to receive the blessing.