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Our church today has lost much of it's power for good in our world because it is almost universally taught that we can't be perfect so why try. This is an important message in that it is necessary that we know it is only threw what Christ did for us that we reach perfection, but when that thought is taken to it's extreme it becomes "don't try".
Paul explains what Christ asks of us when we give ourselves to His keeping and let Christ in us make us righteous. It is in Romans 7:
15 For that which I do I allow not: for what I would, that do I not; but what I hate, that do I.
16 If then I do that which I would not, I consent unto the law that it is good.
17 Now then it is no more I that do it, but sin that dwelleth in me.
18 For I know that in me (that is, in my flesh,) dwelleth no good thing: for to will is present with me; but how to perform that which is good I find not.
19 For the good that I would I do not: but the evil which I would not, that I do.
20 Now if I do that I would not, it is no more I that do it, but sin that dwelleth in me.
Paul admits that in the flesh he is not sin free, as we all are not, but as Christ asks of us, Paul gives his will to being sin free. Most of these posts, and today's church is not teaching that.