The phrase "a sermon about" is correct and usable in written English.
It can be used when referring to a religious discourse or speech that focuses on a specific topic or theme.
Example: "The pastor delivered a powerful sermon about forgiveness and its importance in our lives."
Alternatives: "a discourse on" or "a talk regarding".
On the second Friday, the preacher at the Aziz Bellah Mosque gave a sermon about perseverance.
For the modern churchman, apparently not; it's a sermon about moral spotlessness.
On the third Friday, the preacher at the Aziz Bellah Mosque delivered a sermon about forgiveness and reconciliation.
Desperate to see his daughter in the Olympics, Williams gave a sermon about it at his church.
They heard a sermon about end times and the need to support those in prison, nursing homes and broken homes.
In 1970, Mr. Walker once stood on the trunk of a car near the church and, through a bullhorn, preached a sermon about drug-dealing in the neighborhood.
Often d.j.s will drop a needle on "The Bottle" at a climactic moment in a party, driving the crowd wild, and even while dancing along I've been struck by the irony of half-drunk people raving it up to what is a essentially a biting sermon about the ravages of alcohol.
But there were a few gems, ranging from the ambitious ("Important Aspects of Language and Reality") to the despairing ("HOPELESSLYSTUCK"), and some stirring creative efforts: the auspiciously titled "My Peom," "breakfast w santa," "the devil is a red woman drinking cognac," and "Scene one begins with Rabbi Isidor Chemelwitz giving a funeral sermon about an old dead Jewish woman".
Blahyi began to deliver a sermon, and about a dozen men and women from the town, along with a smattering of curious children, filed into the church.
The film creates his answer with a double exposure: a scene of him giving a fiery sermon about moral courage is laid over the image of him, head bowed, at the kitchen table.
Early on they encounter a priest who gives a raging sermon about the Jews, the Turks and the slave Gypsies, who are given a number of epithets, the most common (and least offensive) being "crows".
