In this is mercy: that our suffering is not wasted if we unite it to Christ's. There is always reason for it, be it our own purification or the reparation of sins - ours or those of another.
We are never left abandoned to suffering without recourse. God is always present and always provides the grace necessary to carry the cross in union with His Son. Perhaps this is why so many crosses, so many sorrows, in my own life have occured around these great feasts - the Sacred and Immaculate Hearts - because there is abundant grace available to those who venerate the two Hearts.
"I will comfort them in their trials," the Lord says of those who are devoted to His Most Sacred Heart. And in the Diary of Divine Mercy He speaks words of comfort, reminding me that He alone is the Savior: "My daughter, let nothing frighten or disconcert you. Remain deeply at peace. Everything is in My Hands."