OT and NT redemption are the same…

“Remember not the former things, nor consider the things of old. Behold, I am doing a new thing; now it springs forth, do you not perceive it? I will make a way in the wilderness and rivers in the desert. The wild beasts will honor me, the jackals and the ostriches, for I give water in the wilderness, rivers in the desert, to give drink to my chosen people, the people whom I formed for myself that they might declare my praise. “Yet you did not call upon me, O Jacob; but you have been weary of me, O Israel! You have not brought me your sheep for burnt offerings, or honored me with your sacrifices. I have not burdened you with offerings, or wearied you with frankincense. You have not bought me sweet cane with money, or satisfied me with the fat of your sacrifices. But you have burdened me with your sins; you have wearied me with your iniquities. 
“I, I am he who blots out your transgressions for my own sake, and I will not remember your sins. Put me in remembrance; let us argue together; set forth your case, that you may be proved right. Your first father sinned, and your mediators transgressed against me. Therefore I will profane the princes of the sanctuary, and deliver Jacob to utter destruction and Israel to reviling.
“But now hear, O Jacob my servant, Israel whom I have chosen! Thus says the Lord who made you, who formed you from the womb and will help you: Fear not, O Jacob my servant, Jeshurun whom I have chosen. For I will pour water on the thirsty land, and streams on the dry ground; I will pour my Spirit upon your offspring, and my blessing on your descendants. They shall spring up among the grass like willows by flowing streams. This one will say, ‘I am the Lord’s,’ another will call on the name of Jacob, and another will write on his hand, ‘The Lord’s,’ and name himself by the name of Israel.” (Isaiah 43:18–44:5)

One problem with spending much time in the OT is that the rebukes to God’s people back then often distract me from the new thing God has done in redeeming believers by grace through faith. Not that this makes me think that God is still looking for obedience as a means of salvation, or that He ever did, but that if I do not obey, the consequences will make me respond to trials as if God is using them to punish me.

If I slip into that thinking, discouragement sets in. It seems like God is looking for obedience as a means of salvation by faith rather than evidence of it. Of course that appeals to human pride, but then there are days when that mountain I try to climb is way too high. This makes all those ‘therefore’ passages repeated in an era when God was using unpleasant consequences to illustrate that the relationship His people had with Him was missing faith in Him and His power. 

Today, since Jesus came, He uses trials to test and build faith. All the punishment I deserve was taken by Christ. Instead of the ‘therefore’ I need to focus on the “but now” and the “I will make a way” which are both true because of His grace and mercy to me.

Actually, salvation in the OT was like that also. God promised a Redeemer and His people were to live by that promise, believing He would keep it, and waiting for it in godly living rather than giving in to their old fears and doing what was right in their own eyes. Salvation has always been by faith. Right living is the evidence of it.

Since Jesus came, we are saved by faith, not by works but demonstrated by works in obedience. Same as the OT. 

Now I’m realizing how easily others separate the two testaments as they do. These ‘therefore’ passages are false accusations in a sense, yet they make me feel like jumping from Isaiah to Matthew. I need to remember that the OT points to Jesus, even in those ‘therefore’ rebukes.

Jesus, keep Yourself continually in my mind so my thinking is all about grace and not about anything else but You and Your promises. You will pour water into my thirsty life, and streams into my barren life. You will pour Your Spirit upon my children and descendants so they too will confess You as Lord and call on Your Name — even call themselves Your children. Keep me from getting caught up in anything else but You, Your will, and Your power to keep such promises as these and even more.  You say my offspring shall spring up among the grass like willows by flowing streams. This one will say, ‘I am the Lord’s,’ another will call on the name of Jacob, and another will write on his hand, ‘The Lord’s,’ and name himself by the name of Israel.” That happens because of Your grace and goodness.