Hi all,
I am renting a PC at Kinkos, so I will make this brief. (Well, as brief as Your's Truly is capable).
The question as to whether or not any Christian has assurance of heaven needs to be weighed between the virtues of love, faith and hope.
Love: Salvation is a gift won for us by Jesus and freely offered by our Heavenly Father. But because it is a gift of love, it cannot be forced. So long as we are on this earth (and in the realm of time) we are free to accept or reject this gift. Once we die, we are judged and our decision becomes final (as in eternal).
We are judged by how we said "yes" to this gift of salvation. It is not simply a spoken affirmation or a mental consent. Actions speak louder than words. We can say "yes" to Jesus but still lead sinful lives. When we willingly sin, we say "no" to Jesus in our hearts and by our actions. Hence, we need to engage in regular repentance and participate in the things that Christ has given us to help us stay on the straight and narrow (prayer, bible reading, sacraments, etc.).
So how far do we go to say "yes" or "no" to God? Only God knows, He sets the agenda. Jesus is the Judge as to who actually attains heaven or ends up in hell. Fr. Mich Pacwa (of EWTN) is sometimes asked whether a certain person is in heaven or hell. He responds, "That's a management question; I'm in sales."
Faith: A Christian has faith in the resurrection and has faith in the promises of God. In other words, we have faith in the plan of salvation won for us by Jesus.
Hope: Am I certain that I will go to heaven? No. Because while I am still on earth, I still have the freedom to accept or reject God, and I don't know where He draws the line. But I hope that I am saved. I have hope that if I follow the way of Jesus, I will properly participate in the salvation He won for me.
But if I say that I am certain that I will go to heaven, I commit the sin of presumption. I judge myself rather than let God be my judge. There are two sins against the virtue of hope. One is despair (I am doomed and nothing will change it) and the other is presumption (everything is a certainty and I need not worry about something going wrong).
I don't have my bible with me, so I can't give any notations, but I will point out that the bible describes what, in my opinion, are examples of Christians going to hell.
1) Gospel of Luke's parable of the Sheep and the Goats. The sheep and goats call Jesus "Lord." Only Christians call Jesus "Lord." The goats are going to hell based on teh lack of charity with which they lived their lives. They are surprised to hear Jesus' judgement. They thought they had a certainty of salvation. How do I, personally, know that I am not a goat? If they could fool themselves, could I not be fool myself.
2) The parable of the wise and foolish virgins. These virgins are awaiting the arrival of the Bridegroom. Only Christians await the arrival of the bridegroom. And yet the foolish virgins did not properly plan for His arrival. I see this as Christians who did not properly participate in the gift of salvation won for them. When the Bridegroom arrives, they end up locked outside of the wedding festivites and they are surprised to discover this. I think this involves Christians ending up in hell. If these virgins were foolish, could I also not end up like them if I am not careful?
So that is my take on the whole thing of heaven and the sin of presumption. I suggest (and this is my personal opinion) that any Christian who emphatically states that he is going to heaven is not "working out his salvation in fear and trembling" as Paul tells us. He is also suggesting that God has removed his gift of freewill, as it seems that he believes he is no longer capable of falling from grace and ending up in hell.
Well, that's a brief post, for you!
I will be back in a couple of days. Everyone have a great weekend.
God bless,
-Eric