‘The perfection to which your attention is urged, does not imply perfection in knowledge or light, but a state of supreme love to God, where all the powers of body and mind are perfectly subject to love’s control, and ceaselessly offered up to God through Christ. This is Christian perfection; not angelic perfection, neither Adamic perfection, but Christian perfection. To think disparagingly of Christian perfection, implies, to my mind, thinking lightly of the atonement. To undervalue the efficacy of the blood of Christ to cleanse is sinful. And if would be sinful to doubt whether the offering presented to God, through Christ, is holy and acceptable.
What you need, in order to bring you into this state, is an offering up of yourself through this purifying medium. Now do you still ask, How soon may I expect to arrive at this state of perfection? Just so soon as you come believingly, and make the required sacrifice, it will be done unto you according to your faith. Christ came to take away our sin, to destroy the works of the devil, and to purge us from all iniquity. The purpose of man’s redemption is not accomplished until he is presented perfect in Christ Jesus. When the Savior said, “It is finished!” then this full salvation was wrought out for you. All that remains is for you to come complying with the conditions, and claim it. As it has been purchased for you, it is already yours. If you do not now receive it, the delay will not be on the part of God, but wholly with yourself.’
source: From Faith and Its Effects (1848), Letter No. VII.