On the question of free will, Sunni orthodoxy attempted a synthesis between human responsibility and divine omnipotence. The champions of orthodoxy accused the Muʿtazilah of quasi-Magian dualism (Zoroastrianism) insofar as the Muʿtazilah admitted two independent and original actors in the universe: God and human beings. To the orthodox it seemed blasphemous to hold that humanity could act wholly outside the sphere of divine omnipotence, which had been so vividly portrayed by the Qurʾān but which the Muʿtazilah had endeavoured to explain away in order to make room for humanity’s free and independent action. Influence of al-Ashʿarī and al-Māturīdī
The Sunni formulation, however, as presented by al-Ashʿarī and al-Māturīdī, Sunni’s two main representatives in the 10th century, shows palpable differences despite basic uniformity. Al-Ashʿarī taught that human acts were created by God and acquired by humans and that human responsibility depended on this acquisition. He denied, however, that humanity could be described as an actor in a real sense. Al-Māturīdī, on the other hand, held that although God is the sole Creator of everything, including human acts, nevertheless, a human being is an actor in the real sense, for acting and creating were two different types of activity involving different aspects of the same human act.
In conformity with their positions, al-Ashʿarī believed that a person did not have the power to act before he actually acted and that God created this power in him at the time of action; and al-Māturīdī taught that, before an action is taken, a person has a certain general power for action but that this power becomes specific to a particular action only when the action is performed, because, after full and specific power comes into existence, action cannot be delayed.
Al-Ashʿarī and his school also held that human reason was incapable of discovering good and evil and that acts became endowed with good or evil qualities through God’s declaring them to be such. Because humanity in its natural state regards its own self-interest as good and that which thwarts this self-interest as bad, natural human reason is unreliable. Independently of revelation, therefore, murder would not be bad nor the saving of life good. Furthermore, because God’s Will makes acts good or bad, one cannot ask for reasons behind the divine law, which must be simply accepted. Al-Māturīdī takes an opposite position, not materially different from that of the Muʿtazilah: human reason is capable of finding out good and evil, and revelation aids human reason against the sway of human passions.
Despite these important initial differences between the two main Sunni schools of thought, the doctrines of al-Māturīdī became submerged in course of time under the expanding popularity of the Ashʿarite school, which gained wide currency particularly after the 11th century because of the influential activity of the Sufi theologian al-Ghazālī. Because these later theologians placed increasing emphasis on divine omnipotence at the expense of the freedom and efficacy of the human will, a deterministic outlook on life became characteristic of Sunni Islam—reinvigorated by the worldview of Sufism, or Islamic mysticism, which taught that nothing exists except God, whose being is the only real being. This general deterministic outlook produced, in turn, a severe reformist reaction in the teachings of Ibn Taymiyyah, a 14th-century theologian who sought to rehabilitate human freedom and responsibility and whose influence has been strongly felt through the reform movements in the Muslim world since the 18th century. Shiʿism
Shiʿism is the only important surviving non-Sunni sect in Islam in terms of numbers of adherents. As noted above, it owes its origin to the hostility between ʿAlī (the fourth caliph, son-in-law of the Prophet) and the Umayyad dynasty (661–750). After ʿAlī’s death, the Shiʿah (“Party”; i.e., of ʿAlī) demanded the restoration of rule to ʿAlī’s family, and from that demand developed the Shiʿi legitimism, or the divine right of the holy family to rule. In the early stages, the Shiʿiah used this legitimism to cover the protest against the Arab hegemony under the Umayyads and to agitate for social reform.
Gradually, however, Shiʿism developed a theological content for its political stand. Probably under gnostic (esoteric, dualistic, and speculative) and old Iranian (dualistic) influences, the figure of the political ruler, the imam (exemplary “leader”), was transformed into a metaphysical being, a manifestation of God and the primordial light that sustains the universe and bestows true knowledge on humanity. Through the imam alone the hidden and true meaning of the Qurʾānic revelation can be known, because the imam alone is infallible. The Shiʿiah thus developed a doctrine of esoteric knowledge that was adopted also, in a modified form, by the Sufis. The Twelver Shiʿah recognize 12 such imams, the last (Muḥammad) having disappeared in the 9th century. Since that time, the mujtahids (i.e., the Shiʿi jurists) have been able to interpret law and doctrine under the putative guidance of the imam, who will return toward the end of time to fill the world with truth and justice.
On the basis of their doctrine of imamology, the Shiʿiah emphasize their idealism and transcendentalism in conscious contrast to Sunni pragmatism. Thus, whereas the Sunnis believe in the ijmāʿ (“consensus”) of the community as the source of decision making and workable knowledge, the Shiʿah believe that knowledge derived from fallible sources is useless and that sure and true knowledge can come only through a contact with the infallible imam. Again, in marked contrast to Sunnism, Shiʿism adopted the Muʿtazilah doctrine of the freedom of the human will and the capacity of human reason to know good and evil, although its position on the question of the relationship of faith to works is the same as that of the Sunnis.
Parallel to the doctrine of an esoteric knowledge, Shiʿism, because of its early defeats and persecutions, also adopted the principle of taqiyyah, or dissimulation of faith in a hostile environment. Introduced first as a practical principle, taqiyyah, which is also attributed to ʿAlī and other imams, became an important part of the Shiʿi religious teaching and practice. In the sphere of law, Shiʿism differs from Sunni law mainly in allowing a temporary marriage, called mutʿah, which can be legally contracted for a fixed period of time on the stipulation of a fixed dower.
From a spiritual point of view, perhaps the greatest difference between Shiʿism and Sunnism is the former’s introduction into Islam of the passion motive, which is conspicuously absent from Sunni Islam. The violent death (in 680) of ʿAlī’s son, Ḥusayn, at the hands of the Umayyad troops is celebrated with moving orations, passion plays, and processions in which the participants, in a state of emotional frenzy, beat their breasts with heavy chains and sharp instruments, inflicting wounds on their bodies. This passion motive has also influenced the Sunni masses in Afghanistan and the Indian subcontinent, who participate in passion plays called taʿziyahs. Such celebrations are, however, absent from Egypt and North Africa.