I do believe that God takes pleasure in our praise. There is something in our singing and our shouting that moves God. The invitation to rejoice before God is an invitation to publicly demonstrate that what we say we do in private. So we are to literally, sound off in joy to the God who saved us, “The Rock of out salvation” The assumption in these opening verses is that you know who God is and what he has done for us. And, this rejoicing is not contingent upon how you feel or what your going through. (Elaborate on Community)