At the present time, one regards every man as intelligent, even as if he were wise. However, that is not the case. One can be intelligent and have the most stupid thoughts. The greatest foolishness is thought out very intelligently. Especially if one looks at a large part of contemporary science, it must be said: This science is actually intelligent in all areas, but it is certainly not wise.
Source (German): Rudolf Steiner – GA 353 – Die Geschichte der Menschheit und die Weltanschauungen der Kulturvölker – Dornach, May 10, 1924 (page 214)
Translated by Nesta Carsten-Krüger