"Paul also contradicted the Law.
"But the righteousness which is of faith speaketh on this wise, Say not in thine heart, Who shall ascend into heaven? [that is, to bring Christ down from above] or, who shall descend into the deep? [that is, to bring up Christ again from the dead]. But what saith it? The word is nigh thee, even in thy mouth, and in thy heart: that is, the word of faith, which we preach....",
Rom. 10:6-8
Paul mutilated Deut. 30:12-14
"It is not in heaven, that thou shouldest say, Who shall go up for us to heaven, and bring it unto us, that we may hear it, and do it? Neither is it beyond the sea, that thou shouldest say, Who shall go over the sea for us, and bring it unto us, that we may hear it? But the word is very nigh unto thee in thy mouth, and in thy heart, that thou mayest do it".
The latter is only saying that his (Moses) commandments are easy to obtain. They are not far off but as close as one's heart or mouth. Deut. says nothing about "faith."
It refers to seeking "it" and doing "it," not seeking "him" or doing "him."
It does not even imply Christ or Jesus, let alone mention him.
Deut. is referring to Penitence and is not about believing on or bringing down Jesus from heaven or up from the dead.
Deut. is saying that God wills us to repent of sin and that you may know when you have sinned. You have only to look at his law which is very close by."
Alright so starting with the quote in Romans 10, Paul was not contradicting the law. As a side point, it would be very strange for him to do this since he was a Pharisee before his conversion. Now, at the start of chapter ten Paul says it's his hearts desire that the Israelites will be saved (verse1), he then says, recalling his Pharisee history, "For I can testify about them that that they are zealous for God, but their zeal is not based on knowledge." (Verse 2) he explains this in verse 3 by making reference to the same thing Jesus referred to in his ministry, which was that they didn't follow gods law, "but sought to establish their own." He here is referencing how the Pharisees went beyond the law and were oppressing the people, this wasn't gods righteousness - they had set up there own. He then says in verse 4 that Christ is the culmination of the law, "so that there may be righteousness for everyone who believes." This is because the law God gave to the Israelites could not be fulfilled or kept perfectly by any man. But Christ did keep and fulfill it perfectly, hence he was the culmination of the law, a law which served to remind them they were sinful and could never be perfect. But Christ, releases them from this because now regardless of their inability to live up to gods expectations his sacrifice redeems all sin.
He then compares righteousness by law (the law no man could live up to) with righteousness by faith (in Christ who fulfilled the law for all). But he does not contradict either one. He is only explaining Christ's place and importance and saying that he hopes the Israelites will be saved and except Jesus.
So Paul was saying the same thing you are saying about deut. Because you're right, the point being made was that "you have only to look at this law which is close by." But this is exactly Paul's point here. He's saying that Christ fulfilled this law, you no longer have this law against you showing you to be sinful and making you have to make sacrifices - because Christ died as a sacrifice for all sin. So now you no longer need to think of the law this way, but instead you think of the gospel which is not far off, profess faith in Christ as dying for your sins and being raised.
So it's not a contradiction, it's a comparison and explanations of the role Christ had just taken as the messiah.