Spiritual Peace is Through the Atonement of Christ
Source: TTT
Isaiah 53:5
But He was pierced for our transgressions, He was crushed for our iniquities; the punishment that brought us peace was upon Him, and by His stripes we are healed.
Ephesians 2:14, 15
For He Himself is our peace, who has made the two one and has torn down the dividing wall of hostility / by abolishing in His flesh the law of commandments and decrees. He did this to create in Himself one new man out of the two, thus making peace
Colossians 1:20
and through Him to reconcile to Himself all things, whether things on earth or things in heaven, by making peace through the blood of His cross.