There's a pretty good explanation of the reality and need for Purgatory in this link.
Catholic Bible 101
If there is no Purgatory, then we have the absurd situation of a serial murderer (or an Adolf Hitler to take a more extreme example) who makes a sincere deathbed confession, and then waltzes straight into heaven, without in his life ever having made any attempt at personal santification.
So, what (or who) saves a person then? Jesus Christ, or one's own "attempt at personal sanctification"?
Hitler's rages, his blaming of other people, his cruelty, his vindictiveness - all is suddenly sweetness and light, without his ever having made one ounce of effort to reform his character, other than a last minute realisation of what a mongrel he'd really been.
In other words, "God, have mercy on me a sinner!" is not enough?
Scripture is clear,
all have fallen short of the glory of God.
Is one saved by Jesus Christ, or by one's own "effort to reform his character"?
Is it grace or is it works?
Is salvation a gift, or a reward?
It can't be both.
No problem - just come straight in!
Well, that is the invitation offered to all who do the "will of the Father" and believe on the Son. See, we get "in" because of
His righteousness, not our own. (Which Scripture compares to "filthy rags".)
NOBODY gets into heaven unless they are literally perfect, and this means purfication after death if necessary.
Where does Scripture discuss this "purification after death"?
And if Scripture tells us (and it does) that Christ purged our sins, that His blood washes away sins, that He is the Lamb of God who takes away the sins of the world, why the need for further "purification" of sins after death?
It would seem, in that case, that Christ's blood isn't sufficient to wash away sin after all, as more is apparently needed.
Scripture of course, is clear.
Christ's death on the cross means we are not condemned - it doesn't mean we are automatically made pure.
Scripture says otherwise.
I don't know about you, but I think I sin every day, usually in a venial way, but sometimes more seriously.
Absolutely, in the "flesh" we do indeed sin every day. The "inner man", the new creation we are in Christ, having been born again, is without sin. And we stand in Christ's righteousness, being "in" Him.
As for the seriousness of sin, it is
all mortal. (The wages of sin is death)This is why we need our Saviour. He is the only hope of salvation. (The gift of God is eternal life in Jesus Christ)
And this "flesh", this earthly body, will either die and be raised incorruptible and immortal or be instantly transformed into such at Christ's return. (This corruption must put on incorruption, and this mortal, immortality).
The man who wasn't even properly dressed for the heavenly wedding got thrown out on his ear. I believe that parable at least contained an inbuilt reference to Purgatory.
Actually, that parable referred to a man who had not believed and "put on Christ." Christ Jesus is our "garment." (And we have been washed clean by the blood of the Lamb).
All who are in Christ through faith have been saved, have passed from death to life and are sealed by the Holy Spirit until the day of redemption.
God will never leave us or forsake us, and nothing will take us out of His hand. We have been "bought at a price", and belong to Him. He is faithful, even when we fail and are not, and He "everliveth to make intercession for us."