How does unbelief affect our relationship with God?

Unbelief is described as the root cause of separation from God, leading ultimately to condemnation. Hebrews 3:19 states that Israel 'could not enter in because of unbelief,' illustrating that their lack of faith resulted in missed opportunities for rest and the fullness of God's promises. This unbelief mirrors Adam’s sinful reliance on his own understanding and efforts, resulting in a breach of relationship with God. The sermon emphasizes the importance of daily encouragement among believers to stand firm in faith, suggesting that without active faith, one risks falling into unbelief and the resulting spiritual hardening of the heart.