What language techniques are used in the following sentence, and what effects do they have on the reader?: 'for stony limits cannot hold love...

This line from Romeo and Juliet uses personification to drive home Romeo's point.  In the line mentioned above (line 67 of Act 2, Scene 2), "love" takes on human qualities, as it climbs over stone walls -- the stone walls that surround the Capulet residence -- in order to get to Juliet.  In reality, it is Romeo, rather than "love," who has climbed the walls, but attributing the action to "love" makes it feel as though his aims were a bit more lofty than simply hoisting himself over a wall.  Romeo feels that he is compelled by love, a person-like entity that provides him with wings to fly to Juliet and urges him to return to her by any means possible.