3 definitions
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Joy (n.) in God is Habakkuk's last answer: let the fig tree fail and the fields go bare, he will still rejoice.
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Theodicy (n.) gets no explanation in Habakkuk; the answer to his complaint is a summons to be astonished.
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Wrath of god (n.) is accepted by Habakkuk as a mystery redemption needs, and he prays only that in anger God remember mercy.