When we read these prayer words written by St Therese we may realize the purifying value of suffering our Lord sometimes sends us. 

My God, I thank Thee for all the graces Thou hast bestowed on me, and in particular for having made me pass through the crucible suffering. With what joy I shall see Thee on the last day bearing the Cross as the emblem of royalty. As Thou hast made me a partaker of thy holy Cross, grant that I may one day be like to Thee, and bear upon my glorified body the imprint of Thy sacred wounds. (St Therese)