Lucretius, Lib. IV, vv. 1150-1163.
Burton, Anatomy of Melancholy, Part III, Section II, Mem. III, Subs. I.
Judith Cladel, Auguste Rodin Pris sur la Vie, 1903, pp. 103-104. Some slight modifications have been made in the translation of this passage on account of the conversational form of the original.