Read it again. Paul does not say we are to "keep the commandments" which were written in stone...even calling them the ministration of death and condemnation. The law was given NOT to make men holy, NOT to justify man, and NOT to give life. Paul goes to quite some length to explain the purpose of the law. You should study up on that.
Why would Paul tell us to "keep" what Christ has fulfilled in us?
Romans 8:2-4 For the law of the Spirit of life in Christ Jesus hath made me free from the law of sin and death. For what the law could not do, in that it was weak through the flesh, God sending his own Son in the likeness of sinful flesh, and for sin, condemned sin in the flesh: That the righteousness of the law might be fulfilled in us, who walk not after the flesh, but after the Spirit.
Yes, I see a lot of man boasting of how well he keeps the law...what a wonderful thing it is to be so obedient, and how when we try we can succeed.
Not by works of righteousness....but according to His mercy.
Philippians 1:6
Being confident of this very thing, that he which hath begun a good work in you will perform it until the day of Jesus Christ: