Jean de La Bruyère, Luc de Clapiers marquis de Vauvenargues (1903). “La Bruyère and Vauvenargues: Selections from the Characters, Reflexions and Maxims”
Jane Roberts (2011). “The Nature of Personal Reality (A Seth Book): Specific, Practical Techniques for Solving Everyday Problems and Enriching the Life You Know”, p.427, Amber-Allen Publishing