Evangelii Gaudium §138

138. The homily cannot be a form of entertainment like those presented by the media, yet it does need to give life and meaning to the celebration. It is a distinctive genre, since it is preaching situated within the framework of a liturgical celebration; hence it should be brief and avoid taking on the semblance of a speech or a lecture. A preacher may be able to hold the attention of his listeners for a whole hour, but in this case his words become more important than the celebration of faith. If the homily goes on too long, it will affect two characteristic elements of the liturgical celebration: its balance and its rhythm. When preaching takes place within the context of the liturgy, it is part of the offering made to the Father and a mediation of the grace which Christ pours out during the celebration. This context demands that preaching should guide the assembly, and the preacher, to a life-changing communion with Christ in the Eucharist. This means that the words of the preacher must be measured, so that the Lord, more than his minister, will be the centre of attention.