May Quotes - Page 277
Rose Macaulay, Constance Babington Smith (2011). “Letters to a Friend”, p.280, Bloomsbury Publishing
"Statistical Methods for Research Workers". Book by Ronald Fisher, 1925.
Rollo May (1994). “The Courage to Create”, p.69, W. W. Norton & Company
He that upon a true principle lives, without any disquiet of thought, may be said to be happy.
Sir Roger L'Estrange (1714). “Fables of Æsop and other eminent mythologists: with morals and reflections”, p.147