It will be observed in the quotation from the Doctrine & Covenants above that provision is made that the presidents of Seventy are to be "chosen out of the number of the Seventy." It is because of this special provision that when inadvertently High Priests have been selected for presidents of Seventy they have taken their place again in the quorum of High Priests and others from among the Seventy, as provided by the law of God, chosen to fill their place. It will also be observed that the council of the First Seventy, in addition to presiding over their own quorum (the first), have a general presidency over all the quorums of the Church. It is this first quorum, members and presidents together, which constitutes what, by way of explanation, we may call _the_ quorum of Seventy, the quorum of which it is said that they are equal in authority to the quorum of the twelve special witnesses, or Apostles. 5. _Summary._ It may be said by way of recapitulation that the Seventy hold the Melchisedek Priesthood; that with the Twelve, under whose directions they labor, they constitute the foreign ministry of the Church: that their special calling is to travel and preach the gospel in all nations, first to the Gentiles and then to the Jews; that they can, on occasion be employed in the work of the ministry at home, because their Priesthood authorizes them to do good and bring to pass righteousness wherever they may be, and when acting in order and under the direction of the Twelve Apostles they may do whatever is necessary to be done in order to accomplish the purposes of God, whose ministers they are; but their organization has particular reference to their special work of preaching the Gospel in all the world. 6. _An Intelligent and Informed Ministry Contemplated in the Church:_ After this brief review of the organization and duties of the Seventies, it must be clearly manifest that it is the imperative duty of those holding this office in the Priesthood to make careful and thorough preparation to discharge the responsibilities of their high calling as the ambassadors of the Lord Jesus. Being special witnesses of the name of Christ in all the world, preachers (i. e., teachers) of the gospel, and authorized under the direction of the Twelve Apostles to act in the name of the Lord in "building up the Church and regulating all the affairs of the same in all nations" (Doc. & Cov. Sec. cvii), it behooves them to become witnesses who understand the truth of which they testify, skilled workman, ambassadors of whom the Master need not be ashamed. It is evident that the Lord never designed that his ministry should be an ignorant ministry; for to the early Elders of his Church, in this last dispensation, when instructing a number of them to prepare for labor in the vineyard, he said: