Lewis Carroll [Charles Lutwidge Dodgson] (1832–1898), British writer, mathematician. Alice and the White Queen, in Through the Looking-Glass, "Wool and Water," (1872).
In a letter to a child-friend in 1864, Carroll wrote, "If you set to work to believe everything, you will tire out the muscles of your mind, and then you'll be so weak you won't be able to believe the simplest true things." (A Selection from the Letters of Lewis Carroll to His Child-Friends, ed. Evelyn M. Hatch, 1933).