Peace is the Absence of Malice (Sin)
The question is, 'Was sin ever in Heaven?" Well the only fact I know is Lucifer rebelled and Michael was given a sword with which to drive out Lucifer and his pride.
If this is true then it takes a sword to drive out sin. If we consider facts properly then God did not share His Home, His Temple heaven with His enemy and therefore we cannot share our temple with our enemy, as God will not be there. Then He will only live in us when we have used a sword and in most cases used it violently against sin especially our passions that cause us to reject God.
Memories of the habits and the teachings of the Catholic Church