Here’s a great quote by puritan Robert Haldane (d. 1842) which has to do with the righteousness of Christ and our justification. Jerry Bridges used this quote in The Discipline of Grace (specifically in his exposition of Romans 3:21 found on page 49).
“To that righteousness is the eye of the believer ever to be directed; on that righteousness must he rest; on that righteousness he must live; on that righteousness he must die; in that righteousness must he appear before the judgment seat; in that righteousness must he stand forever in the presence of a righteous God.”
Like the Heidelberg Catechism says so well, we can receive Jesus’ righteousness and make it ours in no other way than by faith alone (Q/A 61). Indeed, “My hope is built on nothing less than Jesus’ blood and righteousness!”