How do we know that God's truths are mysterious?

The nature of God and His workings are fundamentally mysteries that cannot be fully grasped by human reasoning. Paul asserts this in 1 Corinthians 2:7, highlighting that the knowledge of God is hidden and can only be understood through divine revelation. Our fallen nature, corrupted by sin, clouds our reason and understanding, making it essential for us to be spiritually renewed in Christ to access these profound truths. Thus, the mystery is integral to the faith, illustrating our dependence on God's grace and enlightenment.