More from Watchman Nee's The Normal Christian Life:
God's way of deliverance is altogether different from man's way. Man's way is to try to suppress sin by seeking to overcome it; God's way is to remove the sinner. Many Christians mourn over their weakness, thinking that if only they were stronger all would be well. The idea that, because failure to lead a holy life is due to our impotence, something more is therefore demanded of us, leads naturally to this false conception of the way of deliverance. If we are preoccupied with the power of sin and with our inability to meet it, then we naturally conclude that to gain the victory over sin we must have more power. "If only I were stronger," we say, "I could overcome my violent outbursts of temper," and so we plead with the Lord to strengthen us that we may exercise more self-control.
But this is altogether a fallacy; it is not Christianity. God's means of delivering us from sin is not by making us stronger and stronger, but by making us weaker and weaker. That is surely rather a peculiar way of victory, you say; but it is the divine way. God sets us free from the dominion of sin, not by strengthening our old man but by crucifying him.
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Truth is...There's not a thing you can do to gain forgiveness from your sins or deliverance from the power of Sin over you. Trying harder won't do it. Praying harder won't do it. Locking yourself in a tower or stranding yourself on a remote island won't do it. Only when you realize that it's not about what you do...but it's all about what Jesus did...only then will God's forgiveness and grace take its full effect in your soul.