How do we know that God has a purpose for our weakness?

The dual statements in Psalm 90:3 reveal a profound truth: while God turns man to destruction, He simultaneously calls us to return to Him. This reflects God's redemptive purpose amidst our frailty. Just as Paul articulates in Romans, the law serves to reveal our sinfulness and need for a Savior, thereby fulfilling God's plan to bring us to Christ. Our weakness brings us to an end of self-reliance, compelling us to seek God's mercy and grace, which are abundantly available through faith in Jesus Christ. God's intention is to lead us from destruction to restoration and reconciliation with Him.