The only thing that keeps God's arrow from striking into the unfaithful and "being made drunk" with their blood is "nothing but the pleasure of God."
Throughout the fire and brimstone sermon of the Reverend Jonathan Edwards the trope of "the hand of God" is used throughout Edwards's oration. The "pleasure of God" is a variation of this trope, expressing even more that it is but a whim of God that he holds onto sinners and that there is even more of a chance that the sinner might plunge into the fires of hell.
At the point in his sermon when Reverend Edwards mentions the arrow of God, he cautions "all that were never born again" and made into new Christians that they are now in the hands of a righteous and angry Maker. No matter how justified they feel in their ways, no matter that they keep up a form of religion in their homes or feel unconvinced of his words, those in his congregation who are not saved will be found abominable in God's eyes and, therefore, be cast into the fires of hell.