Apocalypse Explained # 621
621. And it was in my mouth as honey, sweet, signifies that the Word, in respect to its external, or in respect to its sense of the letter, was still perceived as the delight of good, but as delight only for the reason that it served to confirm the principles of falsity, and the loves of evil, that is, the principles arising from the love of self and of the world, all of which are falsities. That the Word, which is meant by "the little book," was perceived on this account to be "sweet as honey," may be seen in what has been shown above.
Euphrates
In Genesis 2:14 and Psalms 80:9, 10, the Euphrates symbolizes secular knowledge — facts — and the sensory impressions on which facts are based. (Secrets of Heaven 120)