Some 700 years before Jesus came in the flesh, Isaiah, the prophet foretold of the Covenant established by Jesus at the cross. A Covenant of peace. The Hebrew word for peace is shalom. It means much more than just peace, but also prosperity, health, right relationships, total well-being.
In Is. 53:4 & 5, Isaiah says that Jesus took our badness so we could have His goodness.
When we fully grasp that, we will have shalom.