At a time when there is widespread criticism of the quality of many modern day homilies, Pope Benedict XVI has asked the Congregation for Divine Worship and the Discipline of the Sacraments to prepare practical publications such as a Directory on the Homily, in which preachers can find useful assistance in preparing to exercise their ministry (cf. Post-synodal Apostolic Exhortation Verbum Domini, 60). More than 9 decades ago, his predecessor, Benedict XV dedicated a whole encyclical to this important ministry of preaching. An Excerpt:
On Preaching the Word of God
by Pope Benedict XV
The purpose which sacred orators should keep before their mind in performing their duty may be understood from the fact that they may and ought to say of themselves, as did St. Paul "For Christ therefore we are ambassadors." [II Cor. v:20] If then they are ambassadors of Christ they ought to have the same purpose in discharging their office that Christ had in conferring it on them, nay, the very one that Christ Himself had while living upon earth. For neither the Apostles, nor the preachers who followed the Apostles had a different mission from Christ's: "As the Father hath sent me, I also send you." (John xx:21] Now we know why Christ descended from heaven, for He says expressly: "For this came I into the world; that I should give testimony to the truth." (John xviii:37] "I am come that they may have life." (John x:10]
On Preaching the Word of God
by Pope Benedict XV
The purpose which sacred orators should keep before their mind in performing their duty may be understood from the fact that they may and ought to say of themselves, as did St. Paul "For Christ therefore we are ambassadors." [II Cor. v:20] If then they are ambassadors of Christ they ought to have the same purpose in discharging their office that Christ had in conferring it on them, nay, the very one that Christ Himself had while living upon earth. For neither the Apostles, nor the preachers who followed the Apostles had a different mission from Christ's: "As the Father hath sent me, I also send you." (John xx:21] Now we know why Christ descended from heaven, for He says expressly: "For this came I into the world; that I should give testimony to the truth." (John xviii:37] "I am come that they may have life." (John x:10]
Both these purposes therefore must be carried out by the men who devote themselves to the sacred ministry of preaching. They must diffuse the light of truth made known by God, and in those who hear them they must quicken and nourish the supernatural life. In a word, by seeking the salvation of souls they are to promote the glory of God.
As it would, therefore, be wrong to call anyone a doctor who does not practice medicine, or to style anyone a professor of some art who does not teach that art, he who in his preaching neglects to lead men to a fuller knowledge of God and on the way of eternal salvation may be called an idle declaimer, but not a preacher of the Gospel. And would there were no such declaimers! What motive is it that sways them mostly.
Some are moved by the desire of vain-glory and to satisfy it: "They ponder how they can express high rather than practical thoughts, causing weak minds to admire them, instead of working out the salvation of their hearers. They are ashamed of what is simple and plain, lest they be thought to know nothing else. They are ashamed to give milk to the little ones. [Gillebertus Abb. In Cant. Canticor. Serm xxvii, 2.] Whereas Jesus Christ proved by the lowliness of his hearers that He was the One whom men were awaiting: "The poor have the Gospel preached to them." [Matt. xi:5]
What efforts do such men make to acquire reputation by their sermons from the size and wealth of the cities and splendor of the great churches in which they preach? But since among the truths revealed by God there are some which frighten the weakness of our corrupt nature, and which therefore are not calculated to attract the multitude, they carefully avoid them, and treat themes, in which, the place accepted, there is nothing sacred.
Not seldom it happens that in the very midst of a discourse upon the things of eternity, they turn to politics, particularly if any questions of this kind just then deeply engross the minds of their hearers. They seem to have only one aim, to please their hearers and curry favor with those whom St. Paul describes as "having itching ears." [II Tim. vi:3]
Hence that unrestrained and undignified gesture such as may be seen on the stage or on the hustings, that effeminate lowering of the voice or those tragic outbursts; that diction peculiar to journalism; those frequent allusions to profane and non-Catholic literature, but not to the Sacred Scriptures or the Holy Fathers; finally that volubility of utterance often affected by them, wherewith they strike the ears and gain their hearers' admiration, but give them no lesson to carry home. How sadly are those preachers deceived!
Granted that they receive the applause of the uneducated, which they seek with such great favor, and not without sacrilege, is it really worth while when we consider that they are condemned by every prudent man, and, what is worse, have reason to fear the stern judgment of Christ?
--Taken from Pope Benedict XV, Encyclical Humani generis redemptionem On Preaching the Word of God, 15 June 1917, nn 9-10.