Light Upon Light (Nurun ala Nur) Metal

Allah SWT is the light of the heavens and the earth! What does that exactly means and how does that ayah (ayat an-noor) open our hearts to the light of Allah

Allah is the Light of the heavens and the earth.
The example of His light is like a niche with in which is a lamp,
The lamp is within glass, the glass as if it were a pearly [white] star,
Lit from [the oil of] a blessed olive tree,
Neither of the east nor of the west,
Whose oil would almost glow even if untouched by fire.
Light upon light.
Allah guides to His light whom He wills.
And Allah presents examples for the people,
and Allah is Knowing of all things.

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