He did not call upon the Father to increase the loaves. He did that by his own divine power, but, nevertheless, he was not only God, he was man and he was our representative and he must thank the Father for the provision and pray for blessing upon it.
The preacher’s words, the Sunday school teacher’s words, may be instrumental by the Spirit. God uses his people and their words are part of the means that the Spirit uses to bring the elect to salvation. We don't go along with those who say, ‘Regeneration is an invisible subconscious work in the soul, completed in a split second, in a flash of lightning. The soul is put under an anaesthetic: bang! Regeneration completes the work of conversion, and the person is entirely passive. That is form of hyper-Calvinism which has become very popular in these days. It wasn't the Calvinism of Calvin, or the Reformers, or the Dutch Reformers, who perhaps explained these things better than anybody. It wasn't the Calvinism of the English Reformers or the Puritans. Yes, everything started with the work of God through his predestinating electing love; he worked in the heart; but the work of regeneration made a person able to hear, and willing to hear, and as he hears the gospel and the pleadings of the Sunday School teacher or the preacher, so those pleadings are instrumental, and he is consciously drawn and convinced. It was the regenerating work of God that opened his understanding and enabled, inclined, his heart and his will to listen and to respond. That is the Puritan position, the position of Flavel and Goodwin and others, who explain it so clearly. The words of the preacher are instrumental, so he must preach the gospel, and he must do so as persuasively and earnestly as he can.