In Romeo and Juliet, Act 2, Scene 3, most of the Friar's speech features what literary or stage device?

In Act 2, Scene 3 of
, the Friar's speech features an extended . As he carries a basket filled
with herbs, he takes them out and examines them. While speaking about the herbs, he compares
them to children who are born from nature's "womb" (line 11) and who suck on "her
natural bosom" (line 12).

As the extended metaphor goes on, the Friar
compares the nature of the weeds to the different personalities of children (and of people in
general). He says that the weeds and plants all have different natures and goes on to say that
they all possess something of value:

"Oh, mickle is
the powerful grace that lies / In herbs, plants, stones, and their true qualities. / For naught
so vile that on the earth doth live / But to the earth some special good doth give" (lines
15-19).

In other words, plants and weeds, like people,
have "mickle" or a large amount of grace. Even the worst, most poisonous plants, the
Friar says, also provide some good. Similarly, good plants can also be...