Contradiction with Genesis 1:1
Isaiah 40:21 asserts the everlasting nature of God's knowledge and creation, while Genesis 1:1 begins the narrative of creation as having a definitive starting point.
Genesis 1:1: In the beginning God created the heaven and the earth.
Contradiction with Psalm 19:1
Isaiah 40:21 implies that the knowledge should already be evident, whereas Psalm 19:1 describes how the heavens continuously declare God’s glory, suggesting an ongoing revelation.
Psalm 19:1: [To the chief Musician, A Psalm of David.] The heavens declare the glory of God; and the firmament sheweth his handywork.
Contradiction with Romans 1:20
Isaiah 40:21 stresses that the understanding of God has always been known, while Romans 1:20 states that His invisible qualities have been clearly seen, implying a need for ongoing revelation.
Romans 1:20: For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, [even] his eternal power and Godhead; so that they are without excuse: [so...: or, that they may be]
Contradiction with Acts 17:23
Isaiah 40:21 suggests that the understanding of God should be evident, whereas Acts 17:23 shows that even the Athenians were unaware of the "unknown god," indicating a lack of evident understanding.
Acts 17:23: For as I passed by, and beheld your devotions, I found an altar with this inscription, TO THE UNKNOWN GOD. Whom therefore ye ignorantly worship, him declare I unto you. [devotions: or, gods that ye worship]
Contradiction with Job 11:7
Isaiah 40:21 conveys the idea of inherent understanding of God's nature, while Job 11:7 questions the ability of humans to truly comprehend the depths of God, suggesting a fundamental uncertainty.
Job 11:7: Canst thou by searching find out God? canst thou find out the Almighty unto perfection?