So the engagement of the soul in learning is a removal of the accidental illness from the substance of the soul, so that it may return to what it knew at the beginning of primordial nature (awwal al-fitrah).

Raja Yoga: And know that if it were not for the form upon which man exists, knowledge would not have attached to him eternally. For knowledge attached eternally to the temporal phenomenon (al-hadith) only occurred, and never ceases to occur, through the ancient, existent form upon which man was created. Knowledge in its entirety is fashioned according to the form of man, so it is also upon that form which man was created. Thus, knowledge only relates to the known objects due to its relation to its existent likeness. Imagination (al-wahm) falsely conceives that between the existence of the Truth (al-Haqq) and creation there is an extension, and that is due to what it has been accustomed to in sensation regarding the temporal priority among originated things and its lagging behind in manifestations. He—Whose glory is might—said [in the tradition]: "When Allah manifests to a thing, everything humbles itself before Him."

So manifestation (al-tajalli) is an expression for the appearance of the Divine Essence and its attributes,