My ancestor also heard the Rev. Dr. Hawks speak in the afternoon on Sunday, Dec. 7th. There are 3 total references to the Rev. Dr. Hawks in the diary, those that I've noted: Oct. 26, Nov. 23 and Dec. 7. My ancestor was a Methodist Episcopal minister in Baltimore, and was "a Southern man." I have been researching information on people noted in the diary. Here is additional information I found on Francis Lister Hawks:

HAWKS, FRANCIS LISTER: Protestant Episcopalian; b. at Newbern, N.C., June 10, 1798; d. in New York Sept. 26, 1866. He attended the University of North Carolina (B.A., 1815), studied law, and was admitted to the bar in 1819. He was appointed reporter of the supreme court of the State, and elected to the State legislature in 1823. After studying theology under William Mercer Green he entered the ministry in 1827. In Apr., 1829, he became assistant to Dr. Harry Croswell at Trinity Church, New Haven, Conn., but went to Philadelphia a few months later as assistant minister at St. James's. He was elected professor of divinity at Washington (now Trinity) College, Hartford, Conn., in 1830, and rector of St. Stephen's, New York, in Mar., 1831. The following December he became rector of St. Thomas', New York, and soon came to be regarded as the most eloquent pulpit orator of his denomination. He resigned in 1843, as a result of financial difficulties incident to the failure of St. Thomas' Hall, a school for boys established by Hawks at Flushing, L. ., in 1836. He was subsequently rector of Christ Church, New Orleans (1844-49), and of Calvary Church, New York (1849-62). On account of his sympathy for the South, he resigned his charge in 1862 and went to Baltimore as rector of Christ Church; but returned to New York in 1865 as rector of the newly established parish of the Holy Savior. See online book “Recollections of a Long Life” by Joseph Packard (p. 222) for more info—an outstanding preacher.

Hope this helps!