25 The preacher (whose duty is closely allied to the teacher of the fundamentals of religion) should also have the same qualities of sound doctrine and good morals. For that reason, when drawing up the statutes of the provincial and diocesan synods, Charles was most careful to provide preachers full of zeal and holiness to exercise "the ministry of the word." We are convinced that this care is even more urgent in our times when so many men are wavering in the Faith and some vain-glorious men, filled with the spirit of the age, "adulterate the word of God" and deprive the faithful of the food of life.
Source: Editae Saepe (Vatican.va)