John Murray in Redemption Accomplished and Applied:
What Christ is as Savior perfectly dovetails our deepest and most ultimate need. This is just saying that Christ’s sufficiency as Savior meets the desperateness and hopelessness of our sin and misery.
Christ is exactly suited to all that I am in my sin and misery and to all that I should aspire to be by God’s grace. Christ fits in perfectly to the totality of our situation in its sin, guilt, misery, and ill-desert.