The composition of poetry differs from that of prose in the manner of mixing long and short syllables together.

Take a long syllable out of a line of poetry, and put a short one in the room of it, or put a long syllable where a short one should be, and that line will lose its poetical harmony.

It will have an effect upon the line like that of misplacing a note in a song.
The imagery in those books called the Prophets appertains altogether to poetry.

It is fictitious, and often extravagant, and not admissible in any other kind of writing than poetry.
To show that these writings are composed in poetical numbers, I will take ten syllables, as they stand in the book, and make a line of the same number of syllables, (heroic measure) that shall rhyme with the last word.

It will then be seen that the composition of those books is poetical measure.