Many of the ideas in the מוֹרֵה נְבוֹכִים, הַכּוּזָרִי, הַחוֹבוֹת הַלְּבָבוֹת, יַד רמ”ה, הָעִקָּרִים, וְכוּלְהוּ actually were already written in the אֱמוּנוֹת וְדֵעוֹת
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The Influence of R’ Saadia Gaon on the Rambam and all the other Medieval Jewish Philosophers