“Peace I leave with you; my peace I give to you.” (John 14:27)

In the Old Testament, ‘Peace’ implies perfection, health, blessing, happiness and grace etc while on the other hand is ‘War’ and ‘Evil’.
  
“Love and truth will meet; justice and peace will kiss.” (Psalm 85:11)
  
Jesus himself is our peace, “For He is our peace, He who made both one and broke down the dividing wall of enmity, through His flesh, abolishing the law with its commandments and legal claims, that He might create in Himself one new person in place of the two, thus establishing peace.” (Ephesians 2:14-15)

The disciples heard the promise made by Jesus, “I will not leave you orphans.” He also said, “Peace I leave with you; My peace I give to you.”
And that blessings of peace was the felicity that every Jewish people had been dreaming and longing for .  No one can resist the tremendous joy after hearing such an assuring promise!
  
Jesus expected every single one of His children to take pleasure in full happiness. We can see clearly from the parable of the King’s Wedding Banquet, “Go out quickly into the streets and alleys of the town and bring in here the poor and the crippled, the blind and the lame…Go out to the highways and hedgerows and make people come in that my home may be filled.” (Luke 14:21-23)
  
He had not forgotten a single one of us!

“Do not be a faithless man!”