Peace is a function of righteousness. Righteousness is a function of obedience of faith (both at salvation, when it is imputed, and experientially, when it is imparted). Peace reigns in the heart and soul of God.
Treat others the same way you want them to treat you.
If you love those who love you, what credit is that to you? For even sinners love those who love them. If you do good to those who do good to you, what credit is that to you? For even sinners do the same...