What does Luther mean when he says he must be convinced by Scripture and plain Reason?

Luther couples Scripture and plain reason as his (epistemological) basis for his being captive to the Word of God.

Explanation:

Luther couples Scripture and plain reason as his (epistemological) basis for his being captive to the Word of God.

the mongolian invasion of china and central asia resulted in a disruption of the silk road as the chinese garrisons lost support from the chinese kingdoms which fell under the mongols. however, as the mongols established a formal dynasty in china, the successors of genghis khan restored the garrisons along the silk road allowing the safe travel caravans again.

its a map of something