This is what God the Lord says –
the Creator of the heavens, who stretches them out,
who spreads out the earth with all that springs from it,
who gives breath to its people,
and life to those who walk on it:
6 ‘I, the Lord, have called you in righteousness;
I will take hold of your hand.
I will keep you and will make you
to be a covenant for the people
and a light for the Gentiles,
7 to open eyes that are blind,
to free captives from prison
and to release from the dungeon those who sit in darkness.
‘God, in giving us Christ, has with him freely given us all the blessings of the new covenant.’ Matthew Henry.
As Henry goes on to say, here are two of the great New Covenant blessings (and note they are not limited to Jews only. They are for the whole world): light and liberty. By the power of the gospel, blind eyes are opened, and captives are released. It is ”the power of God that brings salvation to everyone who believes: first to the Jew, then to the Gentile” Romans 1:16. Jesus changes lives. He gives people testimonies.
With regard to light see, e,g., Mt.4:16; Jn.3:19; Acts 26:18.
We must believe that even in these increasingly secular/pagan days God can transform people. There is an irony that people want liberty to live as they choose, without any divine interference. But the very freedom they opt for actually ties them up. It puts handcuffs on them and leaves them to wallow in the darkness of their cells. Many are ignorant that they live in a dungeon, but the reality is they do. We rejoice then that ”…if the Son sets you free, you will be free indeed” John 8:36.