“After my speech, the President detached himself from the group of appalling old waxworks who accompanied him and took his place at the lectern. He then gave a kind of "propaganda" speech which was loudly cheered by the bussed-in party faithful at the suitable moment in the text.”

"The Silver-Tongued Sunbeam" http://www.time.com/time/magazine/article/0,9171,848048,00.html. Time (August 7, 1939)

Diogenes Laertius

Modes of Thought (1938).
1930s
Context: The mentality of mankind and the language of mankind created each other. If we like to assume the rise of language as a given fact, then it is not going too far to say that the souls of men are the gift from language to mankind. The account of the sixth day should be written: He gave them speech, and they became souls.

Source: Unlimited Power (1986), p. 413; this paraphrases an observation made by Adlai Stevenson while introducing John F. Kennedy in 1960, as quoted in Adlai Stevenson and The World: The Life of Adlai E. Stevenson‎ (1977) by John Bartlow Martin, p. 549:
Context: There were two great orators of antiquity. One was Cicero, and the other Demosthenes. When Cicero was done speaking, people always gave him a standing ovation and cheered, "What a great speech!" When Demosthenes was done, people said, "Let us march," and they did. That's the difference between presentation and persuasion. I hope to be classified in the latter category.

Source: Praise of Eloquence (1523), p. 62

Bk. III, ch. 11.
1840s, Past and Present (1843)

References

From Nobel Lecture (2014)

Humor and the Presidency (1987).
1980s