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."
And the disobedient to the wisdom of the just - The “disobedient” here are the unbelieving, and hence the impious, the wicked. These he would turn to the wisdom of the just, or to such wisdom as the “just” or pious manifest - that is, to true wisdom.