“It is finished!” (John 19:30)
Has Christ perfected and completely finished all His work for us? How sweet a relief is this to against all the defects and imperfections of all the works which are wrought by us.
There is nothing finished that we do. All our duties are imperfect duties; they come off lamely and defectively from our hands. O there is much sin and vanity in the best of our duties.
But Jesus Christ has finished all His work, though we can finish none of ours. And so, even though we are defective, poor, imperfect creatures in ourselves, yet we are complete in Christ. His complete obedience being imputed to us, makes us complete, and without fault before God.
— John Flavel, The Fountain of Life