Often in the Christian life our spiritual growth is hindered because we won't admit flaws. We cannot grow in areas if we refuse to admit we need to grow in areas.
The message of the bible is that man is under the curse of sin. The biblical ethic is so high that an honest understanding of its requirements tells us that we constantly fail.
God has grace on us and counts feeble attempts as a keeping of the law through the purifying blood of Jesus. Grace covers all our transgressions. We should not seek to sin because we have grace. If we are truly saved by grace the grace of God that saves us will naturally make us desire to do good works.
Grace which saves comes from our union with Jesus through faith in his death. The same union with Jesus that comes through faith also begins to change us degree by degree to be like Jesus.
It is faith in the cross which saves us and it is also faith in the cross which is the power which pushes us to grow in grace. Often it is easy to think that salvation and sanctification are caused by two different causes. We are saved and now need to figure out how to live.
Of course there is a need to figure out what Christian life entails, but the element behind both is the life, death, and resurrection of Jesus. The link between justification and sanctification is that both events are tied together and driven by the same element faith in the work of Jesus.
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