From Balzac's "Louis Lambert"

     New ideas require new words, or a new and expanded use of old words, extended and defined in their meaning. Thus Lambert, to set forth the basis of his system, had adopted certain common words that answered to his notions. The word Will he used to connote the medium in which the mind moves, or to use a less abstract expression, the mass of power by which man can reproduce, outside himself, the actions constituting his external life. Volition--a word due to Locke--expressed the act by which a man exerts his will. The word Mind, or Thought, which he regarded as quintessential product of the Will, also represented the medium in which the ideas originate to which thought gives substance. The Idea, a name common to every creation of the brain, constituted the act by which man uses his mind. Thus the Will and the Mind were the two generating forces; the Volition and the Idea were the two products.