44 It will be for the Council, naturally, to decide what reforms are to be introduced into the Church's legislation and discipline. The post-conciliar committees, or commissions-especially the Commission for the Revision of Canon Law, which has already been set up-will concern themselves with the task of formulating in concrete terms the recommendations of the Ecumenical Synod. It will be your duty, therefore, Venerable Brethren, to indicate to us what decisions are required for purifying and rejuvenating the Church's image. Let Us, for Our part, give public expression once again to this resolve of Ours to do all We can to sponsor this reform. How often in past centuries has the determination to instigate reforms been associated with the holding of ecumenical councils! Let it be so once more; but this time not with a view to removing any specific heresies concerning the Church, or to remedying any public disorders-for disorders of this sort have not, thank God, raised their head in our midst-but rather with a view to infusing fresh spiritual vigor into Christ's Mystical Body considered as a visible society, and to purifying it from the defects of many of its members and urging it on to the attainment of new virtue. The Kind of Reform Necessary
Source: Ecclesiam Suam (Vatican.va)