How do we know that true believers can err from God's ways?

The scriptures clearly illustrate that even genuine believers can stray from the paths God has ordained for them. In Isaiah 63:17, the prayer acknowledges this struggle, revealing that the true people of God can experience times of error and hardness of heart. The history of Israel serves as a poignant reminder that God's chosen people have often rebelled despite His manifold mercies. Such erring highlights the importance of vigilance in faith and ongoing repentance, as believers must constantly seek God’s grace to correct their paths and return to His ways.