The anger of the Lord is instrumental, hypothetical, conditional, and subject to His will...Far from being an expression of "petulant vindictiveness," the message of anger includes a call to return and to be saved...It is not expression of irrational, sudden, and instinctive excitement, but a free and deliberate reaction of God's justice to what is wrong and evil. For all its intensity, it may be averted by prayer. There is no divine anger for anger's sake. Its meaning is...instrumental: to bring about repentance; its purpose and consummation is its own disappearance.
-Abraham J. Heschel