Do you mortify; do you make it your daily work; be always at it whilst you live; cease not a day from this work; be killing sin or it will be killing you. Your being dead with Christ virtually, your being quickened with him, will not excuse you from this work. And our Saviour tells us how his Father deals with every branch in him that beareth fruit, every true and living branch. ” He purgeth it, that it may bring forth more fruit,” John 15:2. He prunes it, and that not for a day or two, but whilst it is a branch in this world.
– John Owen –
from The Mortification of Sin in Believers, volume 6 of Works, pages 9-10