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To Saadia, and especially to Bahya and Maimonides, the test of value is rationality. The important laws of the Bible are those known as the rational commandments. The other class, the so-called traditional commandments, would also turn out to be rational if we knew the reason why they were commanded. And in default of exact knowledge it is the business of the philosopher to suggest reasons.

Neither of these two data being vouched for by any but their respective authors, who lived a long time after Bahya, we are left to such indirect evidence as may be gathered from the content of Bahya's ethical work, the "Duties of the Hearts."

A still stronger argument against Bahya as the author of our treatise is that derived from the content of the work, which moves in a different circle of ideas from the "Duties of the Hearts." Our anonymous author is an outspoken Neo-Platonist.

Bahya lays the greatest stress upon the commandments of the heart, i. e., upon the purity of motive and intention, upon those laws which concern feeling and belief rather than outward practice. Judah Halevi's attitude is different.

In so far as a reader of the "Duties of the Hearts" recognizes here and there an idea met with in Gabirol's "Fons Vitæ," there can scarcely be any doubt that the latter is the more original of the two. Gabirol did not borrow his philosophy or any part thereof from Bahya.

All this we have already found in Bahya much better expressed, and Bahya is also without doubt the source of Ibn Zaddik's discussion of God's unity. We must now review briefly the practical part of Ibn Zaddik's philosophy as it is found in the fourth part of the "Microcosm."

These men composed an encyclopædia of fifty-one treatises in which is combined Aristotelian logic and physics with Neo-Platonic metaphysics and theology. In turn such Jewish writers as Ibn Gabirol, Bahya, Ibn Zaddik, Judah Halevi, Moses and Abraham Ibn Ezra, were much indebted to the Brethren of Purity. This represents the Neo-Platonic influence in Jewish philosophy.

That these duties are incumbent upon us is clear from every point of view. Like Saadia Bahya finds the sources of knowledge, particularly of the knowledge of God's law and religion, in sense, reason, written law and tradition.

As the title of the work indicates, Bahya saw the great significance of a distinction made by Mohammedan theologians and familiar in their ascetic literature, between outward ceremonial or observance, known as "visible wisdom" and "duties of the limbs," and inward intention, attitude and feeling, called "hidden wisdom" and "duties of the hearts."

There is no doubt that this emphasis is due to Neo-Platonic influence, some of which may have come to Bahya from Gabirol, the rest probably from their common sources. We see, Bahya begins his discussion of the unity of God, that the causes are fewer than their effects, the causes of the causes still fewer, and so on, until when we reach the top there is only one.