Letter, 11 Nov. 1937, in Step by Step (1939) p. 186. Cf. the proverb "He who rides a tiger is afraid to dismount" (see Concise Oxford Dictionary of Proverbs under rides)
Oscar Wilde, Russell Jackson, Ian Small (2000). “The Complete Works of Oscar Wilde: Poems and poems in prose”, p.148, Oxford University Press on Demand
United States. President (1945-1953 : Truman), Harry S. Truman (1962). “Harry S. Truman: Containing the Public Messages, Speeches, and Statements of the President, 1945-53”