In Friar Lawrence's speech (act 2, scene 3, lines 1€“30), how does he use contrast and plant qualities to draw a moral about man's own nature?

The friar begins the
scene by musing over the fact that the earth gives us so many different kinds of plants, and
they have all different kinds of properties and powers. Some are full of medicinal properties,
and others could kill us with their poison. He is obviously keenly interested in the contrasts
between these two, and he is even more interested when both propertiesthe beneficial and the
malignantreside in the same flower. He finds one such flower and remarks that, within
it,

Poison hath residence and medicine power.
For
this, being smelt, with that part cheers
each part:
Being tasted, stays all
senses with the heart.
Two such opposed kings encamp them still,
In man as
well as herbsgrace and rude will. (2.3.24€“29)

Thus, not
only doessee that plants can contain these opposing qualities, he compares them to humans, as we
can contain these opposites as well. He uses ato describe the good properties and bad properties
as kings who oppose one another. They...