Peace should be a hallmark of the godly person, first because it is a Godlike trait: God is called the God of peace several times in the New Testament. He took the initiative to establish peace with rebellious men, and He is the author of both personal peace as well as peace among men. Peace should be part of our character also because God has promised us His peace, because He has commanded us to let peace rule in our lives and relationships, and because peace is a fruit of the Spirit and therefore an evidence of His working in our lives.
Hell reigns wherever there is no peace with God.
What peace can they have who are not at peace with God?
God cannot give us a happiness and peace apart from Himself, because it is not there. There is no such thing.
[Peace] is the very essence of His nature, one of His attributes. God is at all times at perfect peace, without any discord within Himself. He is never under stress, worried, anxious, fearful, unsure, or threatened. He is always perfectly calm, tranquil, and content. There are no surprises for His omniscience, no changes for His immutability, no threats to His sovereignty, no doubts to cloud His wisdom, no sin to stain His holiness. Even His wrath is clear, controlled, calm, and confident.
God the Father is called the “God of peace” (Hebrews 13:20). God the Son, the “Prince of peace” (Isaiah 9:6). God the Holy Ghost, the “Spirit…of peace” (Ephesians 4:3).