Please give us any one such reference - chapter and verse where Paul, or any other writer says that it is impossible to keep the Law of Moses.
I 'll quote more Scripture if you wish. James 2:10 is a good one.
James 2:10 For whosoever shall keep the whole law, and yet offend in one point, he is guilty of all.
I have done my part - I have provided a text from Phillipians 3 where Paul declares he was, yes, blameless, in respect to keeping the Law.
I have refuted this already. Didn't you read my post? Paul didn't say he kept all the law, only the righteousness of the law. Do the grammar. Find out the difference.
It will be interesting, and disturbing for we "in-errantness" types, if you can find a text that will force us to accept internal inconsistency in the Bible.
There is no inconsistency if you keep things in context. You will not do that.
With respect to the law:
Romans 3:9-20 What then? are we better than they? No, in no wise: for we have before proved both Jews and Gentiles, that they are all under sin;
10 As it is written, There is none righteous, no, not one:
11 There is none that understandeth, there is none that seeketh after God.
12 They are all gone out of the way, they are together become unprofitable;
there is none that doeth good, no, not one.
13 Their throat is an open sepulchre; with their tongues they have used deceit; the poison of asps is under their lips:
14 Whose mouth is full of cursing and bitterness:
15 Their feet are swift to shed blood:
16 Destruction and misery are in their ways:
17 And the way of peace have they not known:
18 There is no fear of God before their eyes.
19 Now we know that what things soever the law saith, it saith to them who are under the law: that every mouth may be stopped, and all the world may become guilty before God.
20 Therefore
by the deeds of the law there shall no flesh be justified in his sight: for
by the law is the knowledge of sin.
The law? No one can keep it. No one can do good. Doing good is keeping the law.