Several figures of speech are used with great effort to compare mankind's situation to objects of nature as analyzed through the eyes of God.
Here is one simile:
The wrath of God is like great waters that are damned for the present; they increase more and more, and rise higher and higher, till an outlet is given; and the longer the stream is stopped, the more rapid and mighty is its course, when once it is let loose.
This compares the building of God's anger to the pressure of water. The purpose of this comparison is to get the congregation to think about how when God actually releases his anger, it is going to be done with great force.
This next sentence contains both a metaphor and personification:
The bow of God's wrath is bent, and the arrow made ready on the string, and justice bends the arrow at your heart, and strains the bow, and it is nothing but the mere pleasure of God, and that of an angry God, without any promise or obligation at all, that keeps the arrow one moment from being made drunk with your blood.
This metaphor compares God's anger to the string of a bow being pulled and ready to let go, but not yet let go. This comparison proves that God's wrath could once again come with great power and severely destroy mankind if he so chose. Later, he gives an arrow the human ability to experience being drunk. Being drunk means a great amount of alcohol would be consumed. Here, he suggests that an arrow would consume a great amount of blood.
Edwards is very famous for creating this image of a human being held by God's hand over a fiery pit. This visual image he uses to compare to the actual relationship between God and man:
The God that holds you over the pit of hell, much as one holds a spider, or some loathsome insect over the fire, abhors you, and is dreadfully provoked...
This quote also contains a simile...
Good luck using these figures of speech!