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."
To turn the hearts of the fathers to the children - In the time of John the Jews were divided into a number of different sects. See the notes at Matthew 3:7. They were opposed violently to each other, and pursued their opposition with great animosity. It was impossible but that this opposition should find its way into families, and divide parents and children from each other. John came that he might allay these animosities and produce better feeling. By directing them all to “one Master,” the Messiah, he would divert their attention from the causes of their difference and bring them to union. He would restore peace to their families, and reconcile those parents and children who had chosen different sects, and who had suffered their attachment “to sect” to interrupt the harmony of their households. The effect of true religion on a family will always be to produce harmony. It attaches all the family to “one” great Master, and by attachment to him all minor causes of difference are forgotten.