In Psalm 122 David in reference to Jerusalem says in verses 7 & 8:
7 Peace be within your walls,
Prosperity within your palaces.”
8 For the sake of my brethren and companions,
I will now say, “Peace be within you.”
He goes on in verse 9:
9 Because of the house of the Lord our God I will seek your good.
David’s reason for seeking peace within the walls of Jerusalem was because it housed the house of God, the temple. That’s where God lived and was to be found. In his mind if Jerusalem was at peace and prospered the house of God would prosper, would be protected and accessible to his “brethren and companions” of verse 8 and therefore they would prosper.
Today God doesn’t live in a physical temple, He lives in us. Our spirit is His temple. We must pursue peace within our soul, our walls because when we are at peace there we are more able to connect with God’s Spirit in our temple, in our spirit. If our soul is not at peace, is stormy, restless, pulled and pushed around by doubts, fears, distractions or thoughts & habits that enslave us, these make it hard for us to access God in our temple. They make it hard for us to connect with Him and know Him in our spirit. The busyness, the storm around the temple keep us from getting to it
Whatever takes away peace in our souls, within our walls we must ask God for His help and work with Him to get rid of it, so we can readily get to the temple within us, connecting with God there, bringing us the many blessings that fellowship with Him brings.