Charles H. Spurgeon on Psalms 65:5

God's judgments are these terribilia, terrible, fearful things; and he is faithful in his covenant; and by terrible judgments he will answer, that is, satisfy our expectation: and that is a convenient sense of these words. But the word which we translate righteousness here, is tzadok, and tzadok is not faithfulness, but holiness; and these terrible things are reverend things; and so Tremellius translates it, and well. Per res reverendas, by reverend things, things to which there belongs a reverence —thou shalt answer us. And thus, the sense of this place will be, that the God of our salvation (that is, God working in the Christian church) calls us to holiness, to righteousness, by terrible things; not terrible in the way and nature of revenge, but terrible, that is, stupendous, reverend, mysterious; so that we should not make religion too homely a thing, but come always to all acts and exercises of religion with reverence, with fear, and trembling, and make a difference between religious and civil actions. John Donne.