The mystics drew their vocabulary largely from the Qur'an, which for Muslims contains all divine wisdom and has to be interpreted with ever-increasing insight. In the Qur'an, mystics found the threat of the Last Judgment, but they also found the statement that God "loves them and they love him," which became the basis for love-mysticism. Strict obedience to the religious law and imitation of the Prophet were basic for the mystics. By rigid introspection and mental struggle the mystic tried to purify his baser self from even the smallest signs of selfishness, thus attaining ikhlas, absolute purity of intention and act. Tawakkul (trust in God) was sometimes practiced to such an extent that every thought of tomorrow was considered irreligious. "Little sleep, little talk, little food" were fundamental; fasting became one of the most important preparations for the spiritual life.
The central concern of the Sufis, as of every Muslim, was tawhid, the witness that "There is no deity but God." This truth had to be realized in the existence of each individual, and so the expressions differ: early Sufism postulated the approach to God through love and voluntary suffering until a unity of will was reached; Junayd spoke of "recognizing God as He was before creation"; God is seen as the One and only actor; He alone "has the right to say I'." Later, tawhid came to mean the knowledge that there is nothing existent but God, or the ability to see God and creation as two aspects of one reality, reflecting each other and depending upon each other (wahdat al-wujud).
The mystics realized that beyond the knowledge of outward sciences intuitive knowledge was required in order to receive that illumination to which reason has no access. Dhawq, direct "tasting" of experience, was essential for them. But the inspirations and "unveilings" that God grants such mystics by special grace must never contradict the Qur'an and tradition and are valid only for the person concerned. Even the Malamatis, who attracted public contempt upon themselves by outwardly acting against the law, in private life strictly followed the divine commands. Mystics who expressed in their poetry their disinterest in, and even contempt of, the traditional formal religions never forgot that Islam is the highest manifestation of divine wisdom. (See intuition.)
The idea of the manifestation of divine wisdom was also connected with the person of the prophet Muhammad. Though early Sufism had concentrated upon the relation between God and the soul, from AD 900 onward a strong Muhammad-mysticism developed. In the very early years, the alleged divine address to the Prophet--"If thou hadst not been I had not created the worlds"--was common among Sufis. Muhammad was said to be "Prophet when Adam was still between water and clay." Muhammad is also described as light from light, and from his light all the prophets are created, constituting the different aspects of this light. In its fullness such light radiated from the historical Muhammad and is partaken of by his posterity and by the saints; for Muhammad has the aspect of sanctity in addition to that of prophecy. An apocryphal tradition makes even God attest: "I am Ahmad (= Muhammad) without m' (i.e., Ahad, One')."
A mystic may also be known as wali. By derivation the word wali ("saint") means "one in close relation; friend." The awliya' (plural of wali) are "friends of God who have no fear nor are they sad." Later the term wali came to denote the Muslim mystics who had reached a certain stage of proximity to God, or those who had reached the highest mystical stages. They have their "seal" (i.e., the last and most perfect personality in the historical process; with this person, the evolution has found its end--as in Muhammad's case), just as the prophets have. Woman saints are found all over the Islamic world.
The invisible hierarchy of saints consists of the 40 abdal ("substitutes"; for when any of them dies another is elected by God from the rank and file of the saints), seven awtad ("stakes," or "props," of faith), three nuqaba' ("leader"; "one who introduces people to his master"), headed by the qutb ("axis, pole"), or ghawth ("help")--titles claimed by many Sufi leaders. Saint worship is contrary to Islam, which does not admit of any mediating role for human beings between man and God; but the cult of living and even more of dead saints--visiting their tombs to take vows there--responded to the feeling of the masses, and thus a number of pre-Islamic customs were absorbed into Islam under the cover of mysticism. The advanced mystic was often granted the capacity of working miracles called karamat (charismata or "graces"); not mu'jizat ("that which men are unable to imitate"), like the miracles of the prophets. Among them are "cardiognosia" (knowledge of the heart), providing food from the unseen, presence in two places at the same time, and help for the disciples, be they near or far. In short, a saint is one "whose prayers are heard" and who has tasarruf, the power of materializing in this world possibilities that still rest in the spiritual world. Many great saints, however, considered miracle working as a dangerous trap on the path that might distract the Sufi from his real goal.