All human knowledge is conditioned and limited, at present, by the properties of light and human symbolism. The solution of all human problems depends upon inquiries into these two conditions and limitations.
Source: From Alfred Korzybski Collected Writings 1920-1950, Collected and Arranged by M. Kendig.
-- Alfred Korzybski, (Jul 3 1879-1950), Polish-US scientist; He is best known for A map is not the territory... in his work Science and Sanity, 1933.