a world which is so rich in content that even the most searching investigation of which the human mind is capable could not exhaust it.
 Arthur Schopenhauer, The World as Will and Representation (1819). copy citation

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Author Arthur Schopenhauer
Source The World as Will and Representation
Topic investigation mind
Date 1819
Language English
Reference
Note Translated by R. B. Haldane and J. Kemp
Weblink http://www.gutenberg.org/files/38427/38427-h/38427-h.html

Context

“Notwithstanding Kant's great doctrine, it will not attempt to use the forms of the phenomenon, the universal expression of which is the principle of sufficient reason, as a leaping-pole to jump over the phenomenon itself, which alone gives meaning to these forms, and land in the boundless sphere of empty fictions. But this actual world of experience, in which we are, and which is in us, remains both the material and the limits of our consideration: a world which is so rich in content that even the most searching investigation of which the human mind is capable could not exhaust it. Since then the real world of experience will never fail to afford material and reality to our ethical investigations, any more than to those we have already conducted, nothing will be less needful than to take refuge in negative conceptions” source