“A smile is the universal welcome.”
Source: The Sense of Humor
Max Forrester Eastman était un écrivain socialiste américain qui patronna le mouvement de Renaissance de Harlem et sympathisa avec Léon Trotsky avant de devenir anticommuniste à la fin de sa vie. Wikipedia

“A smile is the universal welcome.”
Source: The Sense of Humor
Source: Reflections on the Failure of Socialism (1955), p. 57
Source: Reflections on the Failure of Socialism (1955), p. 18
Marx, Lenin and the Science of Revolution (1926), p.22
Source: Reflections on the Failure of Socialism (1955), pp. 37-38
Source: Reflections on the Failure of Socialism (1955), p. 29
Source: Reflections on the Failure of Socialism (1955), p. 45
Source: Reflections on the Failure of Socialism (1955), p. 55
Source: Reflections on the Failure of Socialism (1955), p. 110
Source: Reflections on the Failure of Socialism (1955), p. 110
Source: Stalin's Russia and the Crisis in Socialism (1940), p. 82
Source: Stalin's Russia and the Crisis in Socialism (1940), p. 149
Attributed by internet sources to Enjoyment of Poetry: With Other Essays in Aesthetics (1939), but not confirmed. <br class="br">Source: Enjoyment of Poetry With Anthology for Enjoyment of Poetry (1951), p. 233 https://www.google.com/books/edition/_/oV5emKH2uhcC?hl=en&gbpv=1&bsq=status%20quo <br class="br">Source: The quote appears to have been first published in the essay "The Slogan, 'Propaganda Has No Place in Art,' Is The Symptom Of A Decaying Culture" https://www.google.com/books/edition/_/WX3NyDFUC_MC?hl=en&gbpv=1&bsq=eastman, Stage Magazine (1934).