- If we know about purgatory we can more earnestly strive for perfection (that is, purge ourselves of sin and imperfection) in this life in order to avoid the purging “fire” of purgatory. 2. If we know about purgatory we can more earnestly pray for the souls in purgatory who can no longer gain any merit by their own efforts.
The risks of not knowing about Purgatory are ignoring loved ones in purgatory so that their suffering is prolonged, and spending a long time there ourselves.
"From the Catechism: 1030 All who die in God’s grace and friendship, but still imperfectly purified, are indeed assured of their eternal salvation; but after death they undergo purification, so as to achieve the holiness necessary to enter the joy of heaven.
1031 The Church gives the name Purgatory to this final purification of the elect, which is entirely different from the punishment of the damned.606 The Church formulated her doctrine of faith on Purgatory especially at the Councils of Florence and Trent. The tradition of the Church, by reference to certain texts of Scripture, speaks of a cleansing fire:607 [these numbers refer to footnotes in the Catechism]
As for certain lesser faults, we must believe that, before the Final Judgment, there is a purifying fire. He who is truth says that whoever utters blasphemy against the Holy Spirit will be pardoned neither in this age nor in the age to come. From this sentence we understand that certain offenses can be forgiven in this age, but certain others in the age to come.608
1032 This teaching is also based on the practice of prayer for the dead, already mentioned in Sacred Scripture: "Therefore [Judas Maccabeus] made atonement for the dead, that they might be delivered from their sin.“609 From the beginning the Church has honored the memory of the dead and offered prayers in suffrage for them, above all the Eucharistic sacrifice, so that, thus purified, they may attain the beatific vision of God.610 The Church also commends almsgiving, indulgences, and works of penance undertaken on behalf of the dead:
Let us help and commemorate them. If Job’s sons were purified by their father’s sacrifice, why would we doubt that our offerings for the dead bring them some consolation? Let us not hesitate to help those who have died and to offer our prayers for them.611”
Here are some writings from the saints and other church-approved writings about purgatory. I suggest you read up on it.
Read Me or Rue It http://www.turnbacktogod.com/wp-content/uploads/2010/11/How-To-Avoid-Purgatory.pdf
Purgatory: An Unpublished Manuscript Library : An Unpublished Manuscript on Purgatory | Catholic Culture (or listen to this one on youtube)