Giving Thanks in ALL things

Gratitude - the giving of thanks, this I can do in good times.  When I receive good gifts I naturally feel grateful, but when those good gifts are withheld or removed, then can I still give thanks?  This is the harder lesson I find myself being asked to embrace, and I am floundering.  Swimming in the shallows is easy - it's when you're in over your head that you find out if you really can swim. Will I clench my fists and hold tightly to what I feel is mine, grasping for the things that elude me, the things that are slipping from me, or will I open my hands in childlike trust, believing that what He takes and what He withholds are for good.  As Ann Voscamp voiced the question, do I believe that God is good? If I believe that He is good, then this test, this loss, this lack is ultimately for good and I can hold my hands open and I can raise my voice in thanksgiving even in this.  I CAN give thanks in everything because there is nothing that He can't redeem and use for good - HE IS GOOD and He works all things together for good for us, who are called, chosen, loved.