Please also read:
Clearing Up Misunderstandings About Purgatory
I come on behalf of God. Why am I up in the pulpit today, my dear brethren? What am I going to say to you? Ah! I come on behalf of God Himself. I come on behalf of your poor parents, to awaken in you that love and gratitude which you owe them. I come to bring before your minds again all those kindnesses and all the love which they gave you while they were on earth.