"It is not the speeches which read best which are the greatest speeches. I am not qualified to speak of Demosthenes and Cicero. But, at all events, of the eloquence which has held spellbound the assemblies of which I have been a member, I can truly say posterity cannot possibly judge of their merits by a mere study of the words used. They must see the man, feel the magnetism of his presence, see his gestures, the flash of his eyes. Then, and then only, will they feel what the real essential is between public-speaking on the one hand, and even the most admirable and eloquent writing on the other. I do not say which is best. I personally put the writing far above the speaking. I should tell you the test of a speaker is the audience he addresses. There is no other judge: there is no appeal from that Court."
January 1, 1970
https://en.wikiquote.org/wiki/Speech