Ante-Nicene Fathers, Vol VII:
Lactantius: Chap. VI.—That God is angry

Chap. VI.—That God is Angry.

These are the opinions entertained by the philosophers respecting God. But if we have discovered that these things which have been spoken are false, there remains that one last resource, in which alone the truth can be found, which has never been embraced by philosophers, nor at any time defended: that it follows that God is angry, since He is moved by kindness. This opinion is to be maintained and asserted by us; for 1651 this is the sum and turning-point on which the whole of piety and religion depend: and no honour can be due to God, if He affords nothing to His worshippers; and no fear, if He is not angry with him who does not worship Him. 1652  

Footnotes

In eo enim summa omnis et cardo religionis pietatisque versatur.  

[This fear of the Lord is filial, not servile; and this anger is likewise twofold, including fatherly and corrective indignation, and the wrath of the magistrate, which inflicts penalty and retribution. Compare Ps. vii. 11; also p. 104, note 1, supra.]