Answer:
Friar Laurence says that if you smell the herb it can improve your health, but if you eat the plant it will cause uncertain death. This goes to prove that there is good and evil in everyone and everything. It foreshadows the events to come.
Explanation:
Nothing grows on earth that does not have a useful purpose: 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.
