Heaven

The place and state of perfect and eternal happiness. It consists primarily in the sight of God face to face, termed the Beatific Vision: this sight involves the spiritual possession of him and the love of him to the utmost of the creature's power. Other joys will be the sight of Christ's humanity, companionship with our Lord, the angels and the Saints, and the understanding of the wonders of creation. After the Last Judgment, the risen body will share in the joys of the soul. (Definition from A Catholic Dictionary, 1951)
 

References in Scripture:

• "Be glad and rejoice, for your reward is very great in heaven." Matthew 5:5
• "At that hour the disciples came to Jesus, saying: Who thinkest thou is the greater in the kingdom of heaven? And Jesus calling unto him a little child, set him in the midst of them, And said: Amen I say to you, unless you be converted, and become as little children, you shall not enter into the kingdom of heaven. Whosoever therefore shall humble himself as this little child, he is the greater in the kingdom of heaven." Matthew 18:1-4
• "Again the kingdom of heaven is like to a net cast into the sea, and gathering together of all kind of fishes. Which, when it was filled, they drew out, and sitting by the shore, they chose out the good into vessels, but the bad they cast forth. So shall it be at the end of the world. The angels shall go out, and shall separate the wicked from among the just. And shall cast them into the furnace of fire: there shall be weeping and gnashing of teeth." Matthew 13:47-50
• Jesus saith to him: If thou wilt be perfect, go sell what thou hast, and give to the poor, and thou shalt have treasure in heaven: and come follow me." Matthew 19:21
• "And again I say to you: It is easier for a camel to pass through the eye of a needle, than for a rich man to enter into the kingdom of heaven." Matthew 19:24
• "Not every one that saith to me, Lord, Lord, shall enter into the kingdom of heaven: but he that doth the will of my Father who is in heaven, he shall enter into the kingdom of heaven." Matthew 7:21
• "Know you not that the unjust shall not possess the kingdom of God? Do not err: neither fornicators, nor idolaters, nor adulterers, Nor the effeminate, nor liers with mankind, nor thieves, nor covetous, nor drunkards, nor railers, nor extortioners, shall possess the kingdom of God" 1 Cor 6:9-10

Church Teaching:

• "For whoever offends God, even by one mortal sin, instantly forfeits whatever merits he may have previously acquired through the sufferings and death of Christ, and is entirely shut out from the gate of heaven which, when already closed, was thrown open to all by the Redeemer's Passion." Catechism of Council of Trent, The Creed

Summary

Scripture is very clear when it comes to describing what we must do and NOT do to enter Heaven. We can also clearly see what effects sin has on our souls, and that even one unconfessed mortal sin is enough to keep us out of Heaven. To state otherwise is not Catholic.

Now is the time for every Catholic reading this who has not been to Confession in some time, or who has one or more mortal sins to confess, to seek out a good priest and make a good Confession. Should you pass away tomorrow, will you be in the state of grace?