114 I resort once again to history, and on considering the men of best repute in ancient days, who were ever preferred by grace to the office of ruler or prophet, I discover that some readily complied with the call, others deprecated the gift, and that neither those who drew back were blamed for timidity, nor those who came forward for eagerness. The former stood in awe of the greatness of the ministry, the latter trustfully obeyed Him Who called them. Aaron was eager, but Moses resisted, Isaiah readily submitted, but Jeremiah was afraid of his youth, and did not venture to prophesy until he had received from God a promise and power beyond his years.
Source: Orations (New Advent)