The peaceful state of mind is like a calm, deep flow of a river.  We are conscious, our minds are not lying dormant, but everything seems to be flowing in one direction.  There is no conflicting of different currents where some flow in one direction and some in another.  There are no counter currents or obstructions forcing their way upwards and conflicting with the general stream of things.  Joy:  We are speaking of joy in the Holy Ghost - not rejoicing in ourselves.  God is the direct object of this joy.  In the midst of trials, temptations, persecutions, and even death, there is still oy.