Many other Jewish thinkers appeared in Spain during the period from the second half of the 11th century to the first half of the 12th. Bahya ben Joseph ibn Pakuda wrote one of the most popular books of Jewish spiritual literature, Kitāb al-hidāyah ilā farā’iḍ alqulūb (“Guidance to the Duties of the Heart”), which combines a theology influenced by Saʿadia with a moderate mysticism inspired by the teachings of the Muslim Sufis (see Sufism). The commandments of the heart—that is, those relating to thoughts and sentiments—are contrasted with the commandments of the limbs—that is, the Mosaic commandments enjoining or prohibiting certain actions. Bahya maintained that both sets of commandments should be observed (thus rejecting the antinomian position) but made clear that he was chiefly interested in the commandments of the heart.
Abraham bar Hiyya Savasorda, a mathematician, astrologer, and philosopher, outlined in Megillat ha-megalle (“Scroll of the Revealer”) a view of Jewish history that is reminiscent of ha-Levi but does not emphasize its uniqueness to the same degree; it is also set forth in much less impressive fashion. Living in Barcelona under Christian rule, Bar Hiyya wrote scientific and philosophical treatises not in Arabic but in Hebrew. Hebrew was also used by Abraham ibn Ezra (died 1167), a native of Spain who travelled extensively in Christian Europe. His commentaries on the Bible contributed to the diffusion among the Jews of Greek philosophical thought, to which Ibn Ezra made many disjointed references. His astrological doctrine had a great influence on some philosophers.
The last outstanding Jewish philosopher of the Islamic East, Abū al-Barakāt al-Baghdādī (who died as a very old man sometime after 1164), also belongs to this period. An inhabitant of Iraq, he was converted to Islam in his old age (for reasons of expediency, according to his biographers). His philosophy appears to have had a strong impact on Islamic thought, though its influence on Jewish philosophy and theology is very hard to pin down and may be practically nonexistent. His chief philosophical work, Kitāb al-muʿtabar (“The Book of That Which Has Been Established by Personal Reflection”), contains very few references to Jewish texts or topics. Abū al-Barakāt rejected Aristotelian physics completely. According to him, time is the measure of being and not, as Aristotle taught, the measure of motion; he also replaced Aristotle’s two-dimensional concept of place with the three-dimensional notion of space, the existence of which is independent of the existence of bodies. Jewish Aristotelianism
Jewish thinkers in Muslim Spain and the Maghrib adopted Aristotelianism (as well as systems that stemmed from but also profoundly modified pure Aristotelian doctrine) considerably later than did their counterparts in the Islamic East. Abraham ibn Daud
Abraham ibn Daud (12th century), who is regarded as the first Jewish Aristotelian of Spain, was primarily a disciple of Avicenna, the great 11th-century Islamic philosopher. He may have translated or helped to translate some of Avicenna’s works into Latin, according to one plausible hypothesis, for he lived under Christian rule in Toledo, a town that in the 12th century was a centre for translators. His historical treatises, written in Hebrew, manifest his desire to familiarize his fellow Jews with the historical tradition of the Latin world, which at that time was alien to most of them. But his philosophical work, Sefer ha-emuna ha-rama (“Book of Sublime Faith”), written in 1161 in Arabic, shows few if any signs of Christian influence.
The doctrine of emanation set forth in this work describes in the manner of Avicenna the procession of the 10 incorporeal intellects, the first of which derives from God. This intellect produces the second intellect, and so on. Ibn Daud questioned in a fairly explicit manner Avicenna’s views on the way the second intellect is produced; his discipleship did not mean total adherence. Ibn Daud’s psychology was also, and more distinctively, derived from Avicenna. The argumentation leading to a proof that the rational faculty is not corporeal attempts to derive the nature of the soul from the fact of immediate self-awareness. Like Avicenna, Ibn Daud founded psychology on a theory of consciousness.
Ibn Daud often referred to the accord that, in his view, existed between philosophy and religious tradition. As he remarked, the Sefer ha-emuna ha-rama was not for readers who, in their simplicity, are satisfied with what they know of religious tradition or for those who have a thorough knowledge of philosophy. It was intended for readers of one type only: those who, being acquainted with the religious tradition on the one hand and having some rudiments of philosophy on the other, are “perplexed.” It was for the same audience that Maimonides wrote his The Guide for the Perplexed. Maimonides
Moses Maimonides (Moses ben Maimon; 1135–1204), a native of Spain, is incontestably the greatest name in Jewish medieval philosophy, but his reputation is not derived from any outstanding originality in philosophical thought. Rather, the distinction of Maimonides, who is also the most eminent codifier of Jewish religious law, is to be found in the vast scope of his attempt, in the Dalālat al-hā’irin (The Guide for the Perplexed), to safeguard both religious law and philosophy (the public communication of which would be destructive of the law) without suppressing the issues between them and without trying to impose, on a theoretical plane, a final, universally binding solution to the conflict.
As Maimonides states in his introduction to the Guide, he regarded his self-imposed task as perilous, and he therefore had recourse to a whole system of precautions designed to conceal his true meaning from people who, lacking the necessary qualifications, might misread the book and abandon observance of the law. Maimonides himself notes that these precautions include deliberately contradictory statements meant to mislead the undiscerning reader. The apparent or real contradictions encountered in the Guide are perhaps most flagrant in Maimonides’ doctrine concerning God. There seems to be no plausible hypothesis capable of explaining away the inconsistencies between the following three views:
1. God has an eternal will that is not bound by natural laws. Through an act of his will, he created the world in time and imposed on it the order of nature. This creation is the greatest of miracles; only if it is admitted can other miracles, which interfere with the causally determined concatenations of events, be regarded as possible. The philosophers’ God, who is not free to cut the wings of a fly, is to be rejected. This conception is in keeping with the traditional religious view of God and is avowedly adopted by Maimonides because failure to do so would undermine religion.
2. Humans are incapable of having any positive knowledge concerning God. No positive attributes—e.g., wisdom or life—can be ascribed to God. Contrary to the attributes predicated of created beings, the divine attributes are strictly negative; they state what God is not. For instance, he is not not-wise, and such a statement is not a positive assertion. Hence, only a negative theology is possible—saying what God is not. The way God acts can, however, be known. This knowledge is to be found in natural science.