Saadia Gaon

Saadia is the founding figure of the rationalist Jewish theological tradition that Maimonides later brought to its apex. His method — rational demonstration of theological truths, harmonisation of philosophy and Torah — is the template that Maimonides inherits and transforms.

"All that the prophets have told us is confirmed by reason and observation; and all that reason demonstrates is confirmed by the prophets." (Emunot ve-Deot, introduction)

As Gaon of Sura, Saadia represents the pinnacle of the rabbinic tradition. He defends the authority of the Oral Torah against the Karaites and integrates Talmudic learning with philosophical method. The Beliefs and Opinions is addressed to a rabbinic audience troubled by philosophical doubts.

"The tradition of the sages is a reliable source of knowledge, second only to demonstration and on a par with reliable sense perception." (Emunot ve-Deot, introduction)

Saadia's method is rationalist in the kalam mode: he begins with demonstrations (proofs for creation, for God's unity and incorporeality) and only then shows how revelation confirms reason. This is the Mu'tazilite method applied to Jewish theology.

"God has implanted in our hearts the light of reason, by which we distinguish truth from falsehood." (Emunot ve-Deot, I.1)

Saadia writes in Judaeo-Arabic, uses kalam terminology and argumentation, and is explicitly in dialogue with Islamic theology — especially the Mu'tazilite school, whose rational method he adapts for Judaism. His work is unintelligible outside the Islamic intellectual milieu.

"I have adopted the method of the mutakallimun in establishing the foundations of belief by demonstration." (Emunot ve-Deot, introduction, paraphrase)