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“There is a strange sensation often experienced in the presence
of an audience. It may proceed from the gaze of the many eyes that
turn upon the speaker, especially if he permits himself to steadily
return that gaze. Most speakers have been conscious of this in a
nameless thrill, a real something, pervading the atmosphere,
tangible, evanescent, indescribable. All writers have borne
testimony to the power of a speaker's eye in impressing an
audience. This influence which we are now considering is the
reverse of that picture—the power their eyes may
exert upon him, especially before he begins to speak: after the
inward fires of oratory are fanned into flame the eyes of the
audience lose all terror.”
― William Pittenger, Extempore Speech: How to Acquire and Practice It