“for business reasons, I must preserve the outward signs of sanity.”
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Mark Twain 637
American author and humorist 1835–1910Related quotes
“Joy is an outward sign of inward faith in the promises of God.”
The 4:8 Principle.
The 4:8 Principle (2007)

“A thing which fades
With no outward sign—
Is the flower
Of the heart of man
In this world!”
trans. Arthur Waley, p. 78
Donald Keene's Anthology of Japanese Literature (1955)

“We have now left Reason and Sanity Junction. Next stop, Looneyville.”
Source: Grave Peril

1920s, The Ego and the Id (1923)