13 But why, my beloved, was it that those dead did not rise because of the one word (spoken) through Ezekiel, and why was not their resurrection, both of bones and spirit, accomplished (through that one word)? For lo! By one word the bones were fitted together, and by another the spirit came. It was in order that full perfection might be left for our Lord Jesus Christ, Who with one utterance and one word will raise up at the last day every body of man. For it was not the word that was insufficient, but its bearer was inferior. And with regard to this, understand and observe that when Elijah also, and Elisha his disciple, raised the dead, it was not with one word that they raised them up, but after they had prayed and made intercession and delayed no little time, then they arose.
Source: Demonstrations (New Advent)