Here’s a brief, evangelical Christian summary about the most likely author of Psalm 33:4–5.

Psalm 33:4–5 (NIV): “For the word of the LORD is right and true; he is faithful in all he does. The LORD loves righteousness and justice; the earth is full of his unfailing love.”

Author attribution
– The superscription of Psalm 33 in the Hebrew text reads “Of David” (לְדָוִד), so the most likely author traditionally identified is King David.
– Evangelical Christians typically accept the psalm headings as reliable indications of authorship or at least of early association with David. This fits the broader evangelical conviction in the inspiration and trustworthy transmission of Scripture.

Why David is a plausible author (evangelical perspective)
– David is repeatedly shown in the Bible as Israel’s poet and musician: 1 Samuel describes him playing the harp and Psalm headings elsewhere attribute many psalms to him (traditionally about 73 psalms).
– The themes of Psalm 33 — confidence in God’s word, praise for God’s sovereign power in creation and history, trust in God’s faithfulness — fit well with the theology expressed in other Davidic psalms and with David’s life as a shepherd, warrior, and king who relied on God.
– Evangelicals affirm that even if later editors compiled or arranged the Psalter, the original attribution to David remains the best historical placement unless there is strong evidence to the contrary.

A note about critical scholarship
– Some critical scholars argue that some psalms were written or edited later and that titles can be editorial. Evangelicals vary: many accept some scholarly nuance about compilation history but still affirm that the superscriptions are generally trustworthy and that Davidic authorship is the most reasonable reading for Psalm 33.

How this matters theologically and devotionally
– From an evangelical standpoint, the Davidic authorship connects the psalm’s confident praise to the lived faith of a biblical leader who experienced God’s word and faithfulness firsthand.
– The verses point believers to trust God’s revealed word, to rejoice in his righteous governance, and to worship a God who is both just and loving — themes central to evangelical preaching and devotion.

If you’d like, I can:
– Give a short devotional reflection on Psalm 33:4–5,
– Compare evangelical and critical scholarly views in more detail, or
– Recommend evangelical commentaries on the Psalms (e.g., Kidner, NIV Application Commentary, the ESV Study Bible notes).