The bells themselves are the best of preachers,
Their brazen lips are learned teachers.
From their pulpits of stone, in the upper air,
Sounding aloft, without crack or flaw.
Shriller than trumpets under the Law,
Now a sermon and now a prayer. [ Longfellow ]

Men cannot benefit those that are with them as they can benefit those that come after them; and of all the pulpits from which human voice is ever sent forth, there is none from which it reaches so far as from the grave. [ Ruskin ]