I had no agony as you know, but I can tell you this, that at the last decisive moment, the devil lets loose all his rage against the one that is dying. God permits souls to go through these last trials in order to increase their merits. Souls that are strong and generous, in order that they may have a more glorious place in Heaven, have often had, at the end of their lives and in the moment of death, terrible combats with the angel of darkness. You have been witness to this. But they always come out victorious. God never allows a soul that has been devoted to Him during life to perish at the last moment. Those souls who have loved the Blessed Virgin and invoked her all their lives receive from her many graces in their last struggles. It is the same for those who have been really devout to St. Joseph, to St. Michael, or to any of the saints. I have already said one is glad to have an intercessor with God in those dreadful moments. Some souls die quite tranquilly without experiencing any of those trials. God has His designs in everything. He does or permits all for the good of each particular soul.
~ Sr. M. G., a deceased nun, from An Unpublished Manuscript on Purgatory ~