Full Idea
The task of metaphysics is not to pass over experience in which the world exists, but to understand it thoroughly, since inner and outer experience are certainly the principal source of all knowledge.
Gist of Idea
Metaphysics must understand the world thoroughly, as a principal source of knowledge
Source
Arthur Schopenhauer (The World as Will and Idea [1819], I 428), quoted by Christopher Janaway - Schopenhauer 3 'Will'
Book Reference
Janaway,Christopher: 'Schopenhauer' [OUP 2002], p.39
A Reaction
I wonder to what extent he meant ordinary experience, and to what extent he was advocating the study if science?