I’ve been reading Counsel From the Cross:  Connecting Broken People to the Love of Christ by Elyse Fitzpatrick and Dennis Johnson and have been treasuring many nuggets of teaching and wisdom from the book.  After discussing how we need the gospel and what Christ has accomplished on the cross, the authors explain ways how we can be more gospel-centered Christians.  They offer a sample prayer for the end of the day when you have failed to obey:

Father, please forgive my sin and cause me to walk in holiness.  Thank you that my sin reminds me again how desperately I need the cross and how thankful I am for your grace [emphasis mine].  Thank you that you love me despite my sin today and that you will use even this for your glory.  Lord Jesus, thank you that you bore those sins in your body on the tree.  Thank you for your love and grant me grace to obey because of it.  (p. 84)

I wrote this prayer on a 3×5 card so that I can go back to it daily as a reminder.  This prayer is very helpful for me because I do feel like a failure at the end of the day because I mess up so many times during the day.  By dinner time I’m simply exhausted and feel beat up by all the sins I’ve racked up.  I feel it quite keenly of late.  Rather than despairing, I am told to be thankful for the opportunity because it reminds me how much I need God and the mercy He has shown on the cross.  How glorious!  I hope that you’ll find this prayer encouraging and helpful in your Christian walk.