20 We must strive with all our might and main, Venerable Brethren, to prevent such a state of things from occurring in the future. For it is your duty, by rejecting the unfit and by encouraging, training and guiding the fit, to bring it to pass that there should now be no lack of preachers who are men after God's own heart.
Source: Humani Generis Redemptionem (Vatican.va)