The act of will and the action of the body are one and the same, given in two ways

The passage

The act of will and the action of the body are not two objectively cognized different states linked by the bond of causality, and do not stand in the relation of cause and effect; they are one and the same, only given in two entirely different ways, once quite immediately and once in intuition for the understanding.

§ 18, ZA I 142: »Der Willensakt und die Aktion des Leibes sind nicht zwei objektiv erkannte verschiedene Zustände, die das Band der Kausalität verknüpft, stehn nicht im Verhältniß der Ursache und Wirkung; sondern sie sind Eines und das Selbe, nur auf zwei gänzlich verschiedene Weisen gegeben.« The claim follows c-schopenhauer-body-given-in-two-ways in the same paragraph without a connective, so the map sets no dependency between them; the two ways in which the body is given are the two ways in which the one act is given, and the action of the body »ist nichts Anderes, als der objektivirte, d.h. in die Anschauung getretene Akt des Willens« (same page). Schopenhauer says of this identity that it can be shown but never proved, c-schopenhauer-identity-of-will-and-body-cannot-be-proved; the map has accordingly not made it the conclusion of an argument.