'Illumination' in the Bible
Behold, I am toward God and before Him even as you are; I also am formed out of the clay [though I speak with abnormal wisdom because of a divine illumination].
If any man desires to do His will (God's pleasure), he will know (have the needed illumination to recognize, and can tell for himself) whether the teaching is from God or whether I am speaking from Myself and of My own accord and on My own authority.
[So] that in Him in every respect you were enriched, in full power and readiness of speech [to speak of your faith] and complete knowledge and illumination [to give you full insight into its meaning].
But to each one is given the manifestation of the [Holy] Spirit [the evidence, the spiritual illumination of the Spirit] for good and profit.
For God Who said, Let light shine out of darkness, has shone in our hearts so as [to beam forth] the Light for the illumination of the knowledge of the majesty and glory of God [as it is manifest in the Person and is revealed] in the face of Jesus Christ (the Messiah).
O Timothy, guard and keep the deposit entrusted [to you]! Turn away from the irreverent babble and godless chatter, with the vain and empty and worldly phrases, and the subtleties and the contradictions in what is falsely called knowledge and spiritual illumination.