Contradiction with Isaiah 55:8-9
Deuteronomy 31:30 presents God's clear communication through Moses, whereas Isaiah 55:8-9 emphasizes the incomprehensibility of God's ways and thoughts compared to human understanding.
Isaiah 55:8-9: For my thoughts [are] not your thoughts, neither [are] your ways my ways, saith the LORD.
Contradiction with Romans 11:33-34
Deuteronomy focuses on the clarity of God's song given through Moses, whereas Romans stresses the unsearchable judgments and mysterious ways of God.
Romans 11:33-34: O the depth of the riches both of the wisdom and knowledge of God! how unsearchable [are] his judgments, and his ways past finding out!
Contradiction with Proverbs 25:2
Deuteronomy 31:30 explicitly presents God's words through Moses, contrasting with Proverbs' notion that it is God's glory to conceal a matter.
Proverbs 25:2: [It is] the glory of God to conceal a thing: but the honour of kings [is] to search out a matter.