" . . . And the God of love and peace will be with you."
Even the world relishes the idea of a God of "love and peace." Their "love and peace" god, however, is not the Lord of heaven and earth, who saves sinners and judges all men (according to His perfect and holy standard). Unbelievers' idea of "love and peace" is really more like, "lust, and leave me alone."
But Paul's statement above *does* apply to the redeemed church. The True God of "love and peace" *is* with us; and we particularly *experience* these blessed attributes of His (love and peace), as we are maturing, united, and secure (as the Body of Christ), [see the earlier parts of v. 11].
[Puritan quote of the day: "If temptations arise from natural causes, then natural means, as medicines, are to be used and applied, and people would do well to be persuaded thereunto." --William Bridge, in "A Lifting Up for the Downcast"]