The words- the syllables! Do not forget
The trivialest point, or you may lose your labor
And yet there is in this no Gordian knot
Which one might not undo without a sabre,
If one could merely comprehend the plot.
Enwritten upon the leaf where now are peering
Eyes scintillating soul, there lie perdus
Three eloquent words oft uttered in the hearing
Of poets, by poets- as the name is a poet's, too,
Its letters, although naturally lying
Like the knight Pinto- Mendez Ferdinando-
Still form a synonym for Truth- Cease trying!
You will not read the riddle, though you do the best you can do.
Poe challenges his love to find the riddle in the poem. The solution is to take the first letter of the first line, the second letter of the second line, and so on until the final line of the poem. 
 What do you get? 
 Frances Sargent Osgood 
 
 The name of his lady love is revealed!  How romantic.
A Valentine