Bible Verses About Spiritual Peace: Is through the atonement of Christ

But he was wounded for our iniquities, he was bruised for our sins: the chastisement of our peace was upon him, and by his bruises we are healed.

For he is our peace, who hath made both one, and breaking down the middle wall of partition, the enmities in his flesh:

Making void the law of commandments contained in decrees: that he might make the two in himself into one new man, making peace

And through him to reconcile all things unto himself, making peace through the blood of his cross, both as to the things that are on earth and the things that are in heaven.