"'Twas the saying of [Georgias Leontinus apud Arist. Rhetor. lib. 3. cap. 18… which the Translator renders, Seria Risu, Risum Seriis discutere] an ancient sage that humour was the only test of gravity, and gravity of humour. For a subject which would not bear raillery was suspicious; and a jest which would not bear a serious examination was certainly false wit."
January 1, 1970
https://en.wikiquote.org/wiki/Anthony_Ashley-Cooper%2C_3rd_Earl_of_Shaftesbury