[blackpacific]

To add to your comment, being “in the state of Grace” is roughly equivalent to being “born again”.

However, one must be in the state of Grace to enter heaven.

[knarf]

However, one must be in the state of Grace to enter heaven.

Says the Bible nowhere

[Cronos]

Correct, one must be filled with grace and scrubbed clean of all sin before entering heaven as in heaven (God's presence) there can be no sin.

The final stage in this purification is of course purgatory - not a place but the final burning away of our sin for us heading to heaven