A soul in peace is the true kingdom of God, among other things, because it recognizes but one authority. Its eye is "single;" looking in one direction, and having knowledge of but one master. It feels the deep import of the Savior's words, "Ye cannot serve God and Mammon." And while it recognizes but one authority, in distinction from a two-fold or divided authority over it, it cheerfully submits to that authority and harmonizes with it. It thinks what God thinks, desires what God desires, wills what God wills.
On the other hand, a soul not at peace is one which is rebellious against its rightful master, or which wickedly proposes to serve two rival masters at the same time.