"Then looking at him, Jesus felt love for Him and said to him, 'One thing you lack: go and sell all you possess and give to the poor, and you will have treasure in heaven; and come, follow Me.'" -Mark 10:21
Sorrow and difficulty are going to be parts of our lives. We waste our mind's thoughts when we think that these things ought not to be. That is a waste because they simply are parts of life. The real question we want to pose to ourselves is, "How will I be after this and through this? What is God forming in me that will change me into a new creation?" I am being made new, and my sorrow and difficulty are the pressing things, which God uses to make me who I am becoming from His design.