The natural voice, free from the chest, is most agreeable and effective in conversation and in addressing an audience; it is least fatiguing to the speaker and to the hearer, and penetrates farthest.
Spirited and impressive sermons, mostly in a major key, modulate in elevating ideas to the dominant, in soothing sentiments to the sub-dominant and the relative minor keys, but return and end in the principal key like a musical composition.
Collections of melodies in sermons and speeches of different nations would be most interesting and useful to students in oratory, be it for a dignified and becoming rendering of the great truths and sentiments in religion and humanity, or for persuasion, admonition, and encouragement in secular matters.
The following melodies I have copied from a speech by an Oxford professor, and from a sermon by an English bishop.
From an English speech (by an Oxford professor):

From (the sermon of an English bishop) an English sermon:

—Longman's Magazine.