He will go before him in the spirit and power of Elijah, 'to turn the hearts of the fathers to the children,' and the disobedient to the wisdom of the just; to make ready a people prepared for the Lord."
In short, the calling of John had no other design than to secure for Christ a willing ear, and to prepare for him disciples. As to the angel making no express mention of Christ in this passage, but declaring John to be the usher or standard-bearer of the eternal God, we learn from it the eternal divinity of Christ. With the spirit and power of Elijah By the words spirit and power, I understand the power or excellency of the Spirit, with which Elijah was endued; for we must not here indulge in a dream like that of Pythagoras, that the soul of the prophet passed into the body of John, but the same Spirit of God, who had acted efficaciously in Elijah, afterwards exerted a similar power and efficacy in the Baptist. The latter term, power, is added, by way of exposition, to denote the kind of grace which was the loftiest distinction of Elijah, that, furnished with heavenly power, he restored in a wonderful manner the decayed worship of God; for such a restoration was beyond human ability. What John undertook was not less astonishing; and, therefore, we ought not to wonder if it was necessary for him to enjoy the same gift. 