The answer is:
CASSIUS: That heaven hath infused them with these spirits To make them instruments of fear and warning Unto some monstrous state.
In Shakespeare's "Julius Caesar," Cassius makes reference to the strange behavior of animals and people, as well as the dreadful weather. In that respect, he has not looked for shelter from the thunder and rain because he feels contented that these anomalies are a signal that the gods are providing a warning about a "monstrous state" in the Roman government. Finally, he later learns that the senators intend to make Caesar king.