Answer:
"Of death, contagion, and unnatural sleep:
A greater power than we can contradict
Hath thwarted our intents."
Explanation:
In this entry Friar Laurence is disclosing to Juliet that "a greater power" ended the life of Romeo and that they can do nothing about it, since this more prominent power is more dominant than them.
Also, this is an ideal case of contention between an individual and the obscure, in light of the fact that up to that point the "a greater power" which the monk was alluding to was something obscure to them who are individuals.