Are these two the same?
Isaiah 8:16 Bind up the testimony, seal the law among my disciples. 8:17 And I will wait upon the LORD, that hideth his face from the house of Jacob, and I will look for him. 8:18 Behold, I and the children whom the LORD hath given me are for signs and for wonders in Israel from the LORD of hosts, which dwelleth in mount Zion. 8:19 And when they shall say unto you, Seek unto them that have familiar spirits, and unto wizards that peep, and that mutter: should not a people seek unto their God? for the living to the dead? 8:20 To the law and to the testimony: if they speak not according to this word, it is because there is no light in them.
Romans 3:21 But now the righteousness of God without the law is manifested, being witnessed by the law and the prophets; 3:22 Even the righteousness of God which is by faith of Jesus Christ unto all and upon all them that believe: for there is no difference: 3:23 For all have sinned, and come short of the glory of God; 3:24 Being justified freely by his grace through the redemption that is in Christ Jesus: 3:25 Whom God hath set forth to be a propitiation through faith in his blood, to declare his righteousness for the remission of sins that are past, through the forbearance of God; 3:26 To declare, I say, at this time his righteousness: that he might be just, and the justifier of him which believeth in Jesus.
And before you respond with, "well Isaiah was the Old Testatment," keep in consider....
Hebrews 9:16 For where a testament is, there must also of necessity be the death of the testator. 9:17 For a testament is of force after men are dead: otherwise it is of no strength at all while the testator liveth.
And much of Matthew thru John takes place BEFORE Christ was crucified- much of those four books are in fact, Old Testament ground.
Case in point...
Matthew 8:1 When he was come down from the mountain, great multitudes followed him. 8:2 And, behold, there came a leper and worshipped him, saying, Lord, if thou wilt, thou canst make me clean. 8:3 And Jesus put forth his hand, and touched him, saying, I will; be thou clean. And immediately his leprosy was cleansed. 8:4 And Jesus saith unto him, See thou tell no man; but go thy way, shew thyself to the priest, and offer the gift that Moses commanded, for a testimony unto them.
Case in point, and this one, as late as...
Matthew 8:1 When he was come down from the mountain, great multitudes followed him. 8:2 And, behold, there came a leper and worshipped him, saying, Lord, if thou wilt, thou canst make me clean. 8:3 And Jesus put forth his hand, and touched him, saying, I will; be thou clean. And immediately his leprosy was cleansed. 8:4 And Jesus saith unto him, See thou tell no man; but go thy way, shew thyself to the priest, and offer the gift that Moses commanded, for a testimony unto them.
And that is just one issue you need to carefully consider, before you can even begin to move on from this higher ground of understanding from the Scripture itself, to an even higher one.
Just as in life - the higher the level of abstraction one looks at things from; the more one is not only then able to see...but with greater and greater clarity.