As a child I remember singing "I've got peace like a river, I've got peace like a river, I've got peace like a river in my soul." Isaiah 66 is the biblical text for the lyric of this old tune.
In this place we have the source of peace proclaimed - God's gracious gift and promise. Peace is a fruit of His Spirit (Gal 6) and comes from being united through faith and repentance with Christ, the Prince of Peace. True and lasting peace is found nowhere else.
Biblical peace is not necessarily the cessation of all conflicts without (that won't truly happen until heaven) it is not even necessarily the cessation of war within our hearts (we battle sin, self, and Satan). But it is a removal of the enmity that matters the most - our enmity with God - and due to that there is provided for us, through the mediatorial work of Christ, an inward frame that can withstand the most torrential storm surge. Peace!
I love Matthew Henry's words on this verse:
"God will extend peace to her like a river that runs in a constant stream. The gospel brings with it, wherever it is received in its power, such peace as this, which shall go on like a river, supplying souls with all good and making them fruitful, as a river does the lands it passes through."
God makes a fertile crescent of peace in the lives of His elect. Do you have peace? Do you need peace? Flee to the river's source and drink fully of His abundant and merciful supply. "I've got peace like a river" - in Christ.
On the river,