Passage
I have declared, and I have saved, and I have showed; and there was no strange [god] among you: therefore ye are my witnesses, saith Jehovah, and I am God.
I have declared, and I have saved, and I have showed; and there was no strange [god] among you: therefore ye are my witnesses, saith Jehovah, and I am God.
Isaiah 43:10 Ye are my witnesses, saith Jehovah, and my servant whom I have chosen; that ye may know and believe me, and understand that I am he: before me there was no God formed, neither shall there be after me.
Isaiah 43:11 I, even I, am Jehovah; and besides me there is no saviour.
Isaiah 43:12 I have declared, and I have saved, and I have showed; and there was no strange [god] among you: therefore ye are my witnesses, saith Jehovah, and I am God.
Isaiah 43:13 Yea, since the day was I am he; and there is none that can deliver out of my hand: I will work, and who can hinder it?
Isaiah 43:14 Thus saith Jehovah, your Redeemer, the Holy One of Israel: For your sake I have sent to Babylon, and I will bring down all of them as fugitives, even the Chaldeans, in the ships of their rejoicing.
The verse centers on "saved", "declared", "showed", "strange", "therefore", "witnesses", "saith", and "jehovah". It is saying that the verse draws attention to "saved" and "declared", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 11's "I even I am Jehovah and besides..." into verse 13's "Yea since the day was I am...", so "saved" and "declared" belong inside that flow. In Isaiah context, the local focus is the Holy One of Israel, judgment and restoration, the servant of the LORD, and Zion's hope.
A plain takeaway is to answer the verse's own emphasis on "saved" and "declared" with trust shaped by these words, not by a vague optimism outside the passage.