Isa.43:18; the Past Should Not Be Your Focus.

Isaiah 43:18 (KJV) Remember ye not the former things, neither consider the things of old.

Isaiah 43:18 (NIV)”Forget the former things; do not dwell on the past.

CONTEXT; What's around the verse

Overview
Judah's sovereign LORD intends good for His people (40:1-31). God, not the idols worshiped by the nations, controls the future (41:1-29). Though Israel failed its national calling as God's servant, One from the nation will fulfill God's purpose (42:1-25) when the Creator acts to redeem His chosen people (43:1-44:25). As evidence, God will appoint one named Cyrus to restore Jerusalem (v. 26-45:25). Oppressive Babylon will be crushed, and God's word of blessing for Israel will be fulfilled (46:1-48:22).


Restoration and Protection Promised
The LORD's Promise of Victory
God Will Save His People Again

CROSS REFERENCES;
What's in verses elsewhere.

Deut. 7:18 (KJV)  Thou shalt not be afraid of them: but shalt well remember what the Lord thy God did unto Pharaoh, and unto all Egypt; 

Deut. 8:2 (KJV)  And thou shalt remember all the way which the Lord thy God led thee these forty years in the wilderness, to humble thee, and to prove thee, to know what was in thine heart, whether thou wouldest keep his commandments, or no. 

1 Chron. 16:12 (KJV)  Remember his marvellous works that he hath done, his wonders, and the judgments of his mouth; 

Isaiah 46:9 (KJV)  Remember the former things of old: for I am God, and there is none else; I am God, and there is none like me, 

Isaiah 65:16-17  That he who blesseth himself in the earth shall bless himself in the God of truth; and he that sweareth in the earth shall swear by the God of truth; because the former troubles are forgotten, and because they are hid from mine eyes.  For, behold, I create new heavens and a new earth: and the former shall not be remembered, nor come into mind. 

Philip. 3:13  Brethren, I count not myself to have apprehended: but this one thing I do, forgetting those things which are behind, and reaching forth unto those things which are before, 

COMMENTARY / APPLICATION: Moving From The Head To The Heart What is God teaching here? What does it teach about Jesus?

Remember ye not. God had done great things for His people in ages past, but these would be small in comparison with what He would do for them in the future. [SDA Commentary]

Former things refers to the prophecies of judgment by Isaiah and other prophets (see 42:9, 21-25; 43:9, 10; 46:8, 9; 48:3). [Nelson SB]

43:14-21  God would destroy Babylon and bring His people back to Palestine, a new thing that, when compared to most other wonders of Israel's history, would make those seem as nothing. [Ryrie SB]

The Lord commanded the people not to remember the past (46:9, 10). The
kingdom of Israel inaugurated at the first Exodus and the conquest of the Promised Land would be insignificant compared to the new kingdom God would establish. [Nelson SB]

43:15-21 This section pictures a new exodus for a people once again oppressed, as the Israelites had been as slaves in
Egypt before the exodus. They would cry to God, and again he would hear and
deliver them. A new exodus would take place through a new desert. The past miracles were nothing compared to what God would do for his people in the future. [Life Application SB]

Isaiah 43:14-21 God's creative work never ends. He constantly works to create a people. See note on vv. 1-7. As holy King, He is morally perfect and absolute ruler. He will not let His people totally perish. He will destroy enemies and renew His disciplined people. The Creator God is not a figure of the past who has become senile and forgetful. He is the Creator bringing new redemption to His people. Because God is holy, He cannot overlook iniquity. Because He is a God of redemption, He forgives and restores His people. He is constantly creating new things for His people so we can serve Him and bring His purposes to pass in the world. [Disciple SB]

Philip. 3:13  Brethren, I count not myself to have apprehended: but this one thing I do, forgetting those things which are behind, and reaching forth unto those things which are before, 

Isaiah 65:17  For, behold, I create new heavens and a new earth: and the former shall not be remembered, nor come into mind. 

It has been said that the depressed person lives in the past. The obsessive person lives for tomorrow. The healthy person lives in today. Where do you live?

Those who choose to dwell in the past tend to focus on "shoulds" and "coulds." What should they have done? What could they have done differently? Some people look at their pasts, assume the future is going to be the same way, and give up. True, some have had difficult past experiences, but God is in the present and can make a difference.

We can deal with the past in the sense that we can forgive people and forgive ourselves, but we cannot live the past over. This is not to say we are to ignore the past. Some people figure they must never think about the past; if they do, it must mean they have not forgiven those who hurt them. This negative rigidity usually indicates that they really have not worked through the pain to choose forgiveness. When this is the case, the patterns from the past generally repeat in the present and. future. When people "gloss over" the past, they get mired in bitterness, 

The goal is not to push the past from our memories but to get to the place where we are not embittered by it, where we do not dwell on it or let it control us. Dr. Verle Bell  [Passages Of Life SB re Phil.3:13, 14]

Child of mine, This journey we are on together is forward looking. The destination is ever before you. You have not arrived, but you are on your way. Press on. Take hold of that glorious purpose for which Jesus Christ has taken hold of you. His purpose is that you know him, that you become like him, that your life becomes a channel through which his love can flow to others. His purpose is that you spend eternity enjoying me, starting now! Many have traveled this road before you, and you can learn from them. Consider Paul. Suppose he had taken time out from his journey to dwell on past failures. He could have looked back and become paralyzed by the guilt and shame of a life spent persecuting the
church of Jesus Christ. Why, Paul even held the coats of the murderers who stoned my servant Stephen! He stood by watching in approval. But once he was forgiven, Paul did not waste time or spiritual energy looking back. He knew that the past had been put under the blood of Jesus, and he was free to press on toward the goal. Do you know these things about your past? Come be forgiven, once and for all, and then look back no more. Instead, look ahead to the glory that lies out before you. And press on! God [Postcards from Heaven by Claire Cloninger re Phil.3:13, 14]