Romans 8:28

And we know that all things work together for good to those who love God, to those who are the called according to His purpose. 

This is such a beautiful scripture that really encompasses the nature of God, His goodness towards us, and offers a great assurance of His love for us. God has taken our failures and turned them into successes every single time, and we still marvel at the outcomes of our biggest shortcomings. Does this give us free rein to purposely mess it up? Absolutely not (Romans 6:15 comes to mind), but instead we can delight in the assurance of His kindness that he will provide a better solution way beyond what we ever could.