If the corporeal world is more than our representation, we must say it is in itself what we find in ourselves as will

The passage

If the corporeal world is to be something more than merely our representation, we must say that, apart from representation, hence in itself and in its innermost essence, it is that which we find in ourselves immediately as will.

§ 19, ZA I 148: »Wenn also die Körperwelt noch etwas mehr seyn soll, als bloß unsere Vorstellung, so müssen wir sagen, daß sie außer der Vorstellung, also an sich und ihrem Innersten Wesen nach, Das sei, was wir in uns selbst unmittelbar als Willen finden.« It is the conclusion of the argument linked under Depends on, and is conditional and epistemic: what we »müssen sagen«. It restates as a conditional the assumption of the sentence before, c-schopenhauer-other-objects-judged-by-analogy-with-body (ZA I 147–148). What theoretical egoism denies, that objects known only as representations are, like one's own body, »Erscheinungen eines Willens«, is in § 19 »durch Beweise nimmermehr zu widerlegen« (ZA I 147); the argument gives a reason, not a proof. § 21 states the consequent without the condition (c-schopenhauer-will-alone-is-thing-in-itself).