1. THE BOOK OF GENESIS
The Word of the Old Testament contains heavenly arcana, with every single detail focusing on the Lord, His heaven, the Church, faith, and what belongs to faith; but no human being grasps this from the letter. Judging it by the letter or sense of the letter, nobody views it as anything more than a record, in the main, of external features of the Jewish Church. Yet at every point there are internal features that are nowhere evident in the external, apart from the very few which the Lord revealed and explained to the Apostles, such as that sacrifices mean the Lord; that the land of Canaan and Jerusalem mean heaven, which is therefore called Canaan and the heavenly Jerusalem; and that Paradise is similar in meaning.
(References: Matthew 6:33)