http://www.medievalhistory.net/islamica.htm
The Muslim expansion into Spain in A.D.1085 brought
with it a new world view and new learning previously unknown
in Europe, such as the technology of papermaking. The scholars
of Islam in Spain also brought with them a vast body of
empirical studies in natural science developed by generations of
men from traditions ancient and contemporary who all spoke
from outside of the narrow world view of the Catholic Church
articulated by St. Augustine of Hippo.
Included in the Arabic libraries were a fully developed
mathematics of physics and astronomy, and the ancient Greek
medical texts of Hippocrates and Galen, as well as the entire
body of Aristotle's writings. The Arabs massive written record
of non-Christian discussion included new ideas supported by
incontrovertible proofs of evidence or logic, and some of these
valid new ideas contradicted outright their corollary forms as
taught by the Roman Catholic Church.
It is interesting that our current adversary preserved learning for us for thousands of years.