'Manna' signifies celestial and spiritual good. 'Hidden manna,' as in Revelation 2:17, signifies hidden wisdom, like people have in the third heavens, whose superior wisdom is written in their lives, and not so much in the memories. 'Hidden manna,' in the highest sense, signifies the Lord Himself. 'Manna' signifies the good of truth. It also signifies the good of celestial love conjoined to wisdom.

(Reference: Apocalypse Explained 730; Apocalypse Revealed 120)