No one can attain any degree of holiness without God working in his life, but just as surely no one will attain it without effort on his own part. God has made it possible for us to walk in holiness. But He has given us the responsibility of doing the walking.
– Jerry Bridges
The New Testament calls upon us to take action; it does not tell us that the work of sanctification is going to be done for us…We are in the ‘good fight of faith’, and we have to do the fighting. But, thank God, we are enabled to do it; for the moment we believe, and are justified by faith, and are born again of the Spirit of God, we have the ability. So the New Testament method of sanctification is to remind us of that; and having reminded us of it, it says, ‘Now then, go and do it’.
– Martyn Lloyd-Jones