Here is a beautiful, gospel-centered prayer from Matthew Henry. It is a prayer that, if you prayer it and believe it, will help you root your acceptance and righteousness before God in Christ alone.
I must profess my entire reliance on the Lord Jesus Christ alone for acceptance with God and come in his name.
I do not present my plea before you because of my righteousness, [Daniel 9:18] for I am before you in my guilt, [Ezra 9:15] and cannot stand before you because of it; [Psalm 130:3] but I make mention of Christ’s righteousness, even of his only, who is the LORD our righteousness, [Jeremiah 23:6] and therefore the LORD my righteousness.
I know that even spiritual sacrifices are acceptable to God only through Christ Jesus, [1 Peter 2:5] nor can I hope to receive anything but what I ask of you in his name; [John 16:23] and therefore, bless me in the Beloved, [Ephesians 1:6] that other angel who put much incense to the prayers of the saints and offers them up on the golden altar before the throne. [Revelation 8:3]
I come in the name of the great High Priest who has passed through the heavens, Jesus, the Son of God, who is able to sympathize with my weaknesses, [Hebrews 4:14-15] and is therefore able to save to the uttermost those who draw near to God through him, since he always lives to make intercession for them. [Hebrews 7:25]
Behold, O God, my shield, and look on the face of your Anointed, [Psalm 84:9] in whom you have by a voice from heaven declared yourself to be well pleased; Lord, be well pleased with me in him. [Matthew 3:17]
For more prayers by Henry, check out Method for Prayer, a free online e-book.