Though an army may encamp against me, My heart shall not fear;
Though war may rise against me, In this I will be confident.
This is how psalm 27 verse 3 described peace of the heart that leads to peace of mind and act.
Pope Shenouda III wrote that peace comes from faith. A heart full of faith leads to mind full of peace no matter how much problems are surrounding man. Having internal peace may be affected by surrounding circumstances. Having a calm family and home will have a different impact on a person from a home full of shouting and noise.
This is the reason monks prefer to live in deserts where they can find peace and calm. Therefore, they enjoy peace of mind. May God grant us such peace and calm in order to save our souls and relations.
