"According to the grace of God which was given to me, as a wise master builder I have laid the foundation, and another builds on it. But let each one take heed how he builds on it. 11For no other foundation can anyone lay than that which is laid, which is Jesus Christ. 12Now if anyone builds on this foundation with gold, silver, precious stones, wood, hay, straw, 13each one's work will become clear; for the Day will declare it, because it will be revealed by fire; and the fire will test each one's work, of what sort it is. 14If anyone's work which he has built on it endures, he will receive a reward. 15If anyone's work is burned, he will suffer loss; but he himself will be saved, yet so as through fire."So we're baptized and chrismated, commune with the Body and Blood of our Lord and confess Him throughout our lives, then die. We are justified by this--since these things will be the foundation our body uses at the Resurrection to "put on immortality" like St. Paul says in 1 Cor. 15--yet as we will (most likely) not be completely sanctified (i.e., freed from the passions) and will still have some "wood, hay and straw," there will be a final purification we all go through, and it is for this reason that we pray for the departed: that God will comfort them in their purification, and that they will swiftly go through the final repentance pains necessary to truly enjoy our Lord forever.