The heavens. — Having repeated the Divine promise, the poet appeals to nature and history to confirm his conviction of the enduring character of the truth and grace of God. The heavens are witnesses of it as in Psalms 1:4; Psalms 1:6; Psalms 97:6.
Shall praise. — The present tense would be better.
Wonders. — In the original the word is singular, perhaps as summing up all the covenant faithfulness as one great display of wonder.
Saints. — Here, apparently, not spoken of Israel, but of the hosts above. (See next verse; comp. Job 4:18; Job 15:15 for the same term, “holy ones,” for angels.)