Friar Laurence's soliloquy provides us with an example of foreshadowing. As he fills his basket with poisonous weeds and medicinal flowers, he muses on the fact that Earth is both nature's womb and nature's tomb. New life comes out of the Earth, but the Earth is also a destroyer of life. And everything that comes out of the Earth can be turned to good or bad use.
In keeping with his evident taste for paradox, Friar Laurence states that good may be perverted by evil and that evil may be purified by the good. Ever the optimist, the Friar believes that good can come out of any situation, no matter how bad. But the flip side is also true, as we will see later on in the play, with the tragic deaths of the star-cross'd lovers.
The Friar's musings foreshow his marrying of Romeo and Juliet in the hope that some good may arise out of their misfortune as members of feuding families. Friar Laurence's filling of his basket with poisonous plants also foreshadows his use of a magic sleeping potion that will...
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