If you want to be certain [of what seems strange], then get to work testing it. But beware of being misled, or of being overcome with fatigue, or of becoming fed-up if [your rest] does not come out right once or twice . . . If you see a magnet that does not attract iron, then do not deny its characteristic property, but set your sights on investigating its various states until its power becomes evident to you.
-Zakariya al-Qazwini
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