And I saw in the right hand of him that sat on the throne a scroll written inside and on the back, sealed with seven seals.
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Andreas of Caesarea
AD 637
sealed with seven seals. this signifies either the fulfillment of the book, which is obscure and unknown to all, or the dispensation of the one who searches the depths of the Spirit of God. 1 Cor 2:10
book written within and without. is the all-wise memory of God. The things written on the outside are easily understood according to the literal meaning, but the things inside symbolizing the spiritual meaning are very hard to comprehend.