Tajalli

Tajalli (, divine self-manifestation) is the appearance and disclosure of God as truth in Islamic theoretical mysticism. Tajalli is a process by which God reveals Himself in concrete forms.
Meaning.
Tajalli literally means "manifestation", "revelation", "disclosure" or "epiphany / theophany". Mystics use the term to refer to the manifestation of divine truth in the microcosm of the human heart and the macrocosm of the universe, interrelated in God's creation and constituting a reflection of the majesty of his Tawhid or indivisible oneness. The concept is used five times in the Quran, notably in the following verse:
When Musa arrived at our appointed time and his Lord spoke to him, he said: "O Lord, reveal Yourself to me that I may behold You." "You cannot behold Me," He said. "But look at the mountain: If it remains firm in its place you may then behold Me." But when his Lord appeared on the mountain, making it crumble to a heap of dust, and Musa fell unconscious. When he recovered, he said: "All glory to You. I turn to You in repentance, and I am the first to believe." (7. Al-Araf: 143)
Tajalli in theological commentaries.
Theologians interpreting the Quran understand tajalli as appearance. They emphasize the concept of seeing God, or "Ro'ya". The traditional Ash'aris use the Quranic concept to argue for the possibility of seeing God. To the contrary, Shias and Muta'zilas interpret this verse to prove the impossibility of seeing God.
Tajalli in mysticism.
Divine self-manifestation has an important role in epistemology and ontology for mystics. Two concepts are important to Tajalli; one is "shams", the sun of truth, and the other is the mirror of the heart. According to the symbolical language of mysticism, the sun is a password of Truth and the mirror is the key to the universe and the heart.
Epistemological meaning.
According to epistemological semantics, truth manifests itself in the heart of the human being on a mystical journey. Consequently, by means of divine manifestation within one's self, the mystic could attain to a realization of the truth to such a degree that those attributes he personally embodies shine forth as reflections of The Divine Attributes within his very being. The spiritual wayfarer discovers this through the ascetic or Sufi conduct during his spiritual journey inward to attain to God Consciousness, which he unleashes within himself into the world as a kind of divine charisma. Some mystics of the Sufi path recognize this charisma as a divine presence and regard it as sufficient reason to conclude that the Divine is manifest in the heart of the charismatic. Alternatively, Tajalli is also use to denote a removal of the conceptual veils which occult the truth of The Divine Manifestation - namely every thing that veils Creation's True End, which is to act as a Revelation of God's Divine Attributes.
Hierarchy of manifestation.
Mystics have many levels to achieve intuitive knowledge of God:
Ontological meaning.
According to ontological sense, the absolute truth manifests itself in the universe like the appearing of the sun of truth in the mirror of universe in the heart of the Mystic. The absolute manifests itself in multitude forms in different beings.