Righteousness - Faith and Works

Romans 10
4 For Christ [is] the end of the law for righteousness to every one that believeth.
5 For Moses describeth the righteousness which is of the law, That the man which doeth those things shall live by them.
6 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:)
7 Or, Who shall descend into the deep? (that is, to bring up Christ again from the dead.)
8 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.

This chapter is about the righteousness available to Christians through faith.  It echos the following passage from Deuteronomy, which is about righteousness available to Jews through works described in Deuteronomy.  [The echos are italicized].

Deuteronomy 30
8 And thou shalt return and obey the voice of the LORD, and do all his commandments which I command thee this day.
9 And the LORD thy God will make thee plenteous in every work of thine hand, in the fruit of thy body, and in the fruit of thy cattle, and in the fruit of thy land, for good: for the LORD will again rejoice over thee for good, as he rejoiced over thy fathers:
10 If thou shalt hearken unto the voice of the LORD thy God, to keep his commandments and his statutes which are written in this book of the law, [and] if thou turn unto the LORD thy God with all thine heart, and with all thy soul.
11 For this commandment which I command thee this day, it [is] not hidden from thee, neither [is] it far off.
12 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?
13 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, and do it?
14 But the word [is] very nigh unto thee, in thy mouth, and in thy heart, that thou mayest do it.

These passages are intertwined and difficult. I was only able to understand these words of Paul by some considerable study of Gill, Jamieson, Fausett and Brown. 

Something, only marginally related, occurred to me while studying these passages.  It seems to me that the word righteous has come to be considered antiquated. The word in its current common form appears to be self-righteous.