I find this quote of telling interest:

"0 ye who believe! Fear Allah, and make your utterance straight
forward: That he may make your conduct whole and sound and
forgive you your sins. He that obeys Allah and his messenger, has
already attained the great victory."
Afterward,
The most truthful saying is the book of Allah and the best
guidance is that of Mohammed, God bless and keep him.

[Therefore,]the worst thing is to introduce something new, for
every novelty is an act of heresy and each heresy is a deception."

Seems to me this is key in understanding why the bright star of Eastern civilization waned as it did. An institutionalized decree against innovation will certainly tend to throw a civilization into reverse.

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