The Shaw Pocket Bible Handbook, Walter A. Elwell, Editor, (Harold Shaw Publ., Wheaton , IL; 1984), p. 361
In Scripture, God's strong and vigorous opposition to everything evil. There is a Greek verb that can be used both of anger and of the swelling of buds as the sap rises. It points to the kind of anger that results from a settled and consistent disposition, and not to a losing of one's temper. God's wrath is like that, rather than like human anger on a grand scale. With us, wrath always has elements of passion, lack of self-control, and irrationality. The wrath of God does not.