Short answer. Wahdat al-wujud ("the unity of being") is the metaphysics associated with the school of Ibn al-Arabi (d. 1240): there is only one true existence, God's, and the cosmos is His perpetual self-disclosure. It is routinely summarized as pantheism, and that is too crude. The world is not God; the world is where God shows. That one distinction carries the entire system.
A phrase the shaykh barely used
First, an honesty point that doubles as history. Ibn al-Arabi (the Andalusian master his tradition calls al-Shaykh al-Akbar, "the greatest shaykh") did not build his work around the slogan now attached to his name. As William Chittick (The Sufi Path of Knowledge, 1989) has stressed, wahdat al-wujud was made into a technical banner by the shaykh's interpreters and his critics more than by the man himself. What Ibn Arabi actually wrote is a vast meditation on a handful of Quranic claims taken with complete seriousness: that God is "the First and the Last, the Manifest and the Hidden" (Quran 57:3), that "wherever you turn, there is the face of God" (Quran 2:115), and that everything passes away while "the face of your Lord remains" (Quran 55:26-27). Hold those verses all the way down and you arrive somewhere near the doctrine: only one thing truly is, and everything else is how that one thing appears.
Why "pantheism" is too crude
Pantheism says the world is God: add up the universe and you have summed the divine. On Chittick's reading, that is almost exactly what Ibn Arabi does not say. The cosmos is theophany: tajalli, God's perpetual self-disclosure, renewed moment by moment. The world is not God simpliciter; it is the place where God shows: fully real as a showing, nothing at all as an independent existence.
The load-bearing structure is a pair held in deliberate tension. Tanzih: God's incomparability, utterly beyond every form. Tashbih: God's similarity, genuinely shown in every form. Either alone fails: pure incomparability leaves you a God so distant the cosmos goes dark; pure similarity leaves you idols. In the *Fusus al-Hikam*'s chapter on Noah, Ibn Arabi famously finds both halves inside a single verse ("Nothing is like Him; and He is the Hearing, the Seeing" (Quran 42:11)) incomparability in the first clause, similarity in the second. The truth is the both-and: the eye that sees the veil and the face at once.
Readers of the flagship will recognize the shape: it is the same "two faces" structure the book traces in the Zohar's concealment-and-revelation. To be plain about the tier, that comparison is the book's own reading, a convergence of structure across two mystical traditions, not a claimed genealogy from one to the other.
Annihilation is not the end of the road
The crude version of the Sufi path stops at fana, the famous "annihilation" of the ego in God. But in the classical accounts (Annemarie Schimmel, Mystical Dimensions of Islam, 1975, remains the standard survey), fana is the door, not the room. The completion is baqa, "abiding": the servant who subsists in God, transformed, returned, and still distinct enough to serve.
And here the honest page must mark a live wire. Whether that union is finally identity (the drop is the ocean) or the most intimate participation (the drop is drenched, and still a drop) was contested inside Sufism itself. Later Sufi critics (most famously Ahmad Sirhindi (d. 1624)) proposed wahdat al-shuhud, "the unity of witnessing," as a corrective: the oneness the mystic tastes is real as experience, they argued, but not a fact about being. Where Ibn Arabi himself finally sits on that line is contested-but-grounded: his texts can be quoted in both directions, and the school has argued the point for centuries. Anyone who tells you it is settled is overselling.
One more thing, said plainly: this is a living debate inside a living tradition. Sufi orders still pray, still teach, and still argue this very question, and they do not need an outside summarizer to settle it for them. This page borrows the lens; it does not presume to represent the tradition that ground it.
Common questions
Is wahdat al-wujud the same as pantheism?
No, and that is the whole point of the page: pantheism is too crude. Pantheism says the world is God (add up the universe and you have summed the divine), but on Chittick's reading that is almost exactly what Ibn Arabi does not say. The cosmos is tajalli, God's perpetual self-disclosure renewed moment by moment; the world is not God simpliciter, it is the place where God shows, fully real as a showing and nothing at all as an independent existence.
Did Ibn Arabi actually use the phrase wahdat al-wujud?
Barely. As William Chittick (The Sufi Path of Knowledge, 1989) has stressed, the slogan now attached to his name was made into a technical banner by the shaykh's interpreters and his critics more than by the man himself. What Ibn Arabi actually wrote is a vast meditation on a handful of Quranic claims taken with complete seriousness, including that God is "the First and the Last, the Manifest and the Hidden" (Quran 57:3).
What do tanzih and tashbih mean?
They are the load-bearing pair held in deliberate tension. Tanzih is God's incomparability, utterly beyond every form; tashbih is God's similarity, genuinely shown in every form. Either alone fails: pure incomparability leaves you a God so distant the cosmos goes dark, and pure similarity leaves you idols, so the truth is the both-and, the eye that sees the veil and the face at once.
What is the difference between fana and baqa?
The crude version of the Sufi path stops at fana, the famous "annihilation" of the ego in God, but in the classical accounts (Annemarie Schimmel, Mystical Dimensions of Islam, 1975) fana is the door, not the room. The completion is baqa, "abiding": the servant who subsists in God, transformed, returned, and still distinct enough to serve. Whether that union is finally identity or the most intimate participation is contested-but-grounded, argued inside Sufism for centuries.
This is the careful version of a doctrine the internet flattens into a slogan. The full pattern (concealment and revelation as the two faces of the sacred, from the Gathas to the Zohar to the shaykh of Murcia) is in the book.
Sources
the Qur'an (57:3; 2:115; 42:11; 55:26-27); Ibn al-Arabi, Fusus al-Hikam (chapter on Noah); W. Chittick, The Sufi Path of Knowledge (1989); A. Schimmel, Mystical Dimensions of Islam (1975).