Isaiah 5:20.

"Woe to those who call evil good and good evil, who put darkness for light and light for darkness, who put bitter for sweet and sweet for bitter."

If you read about when Jesus speaks of the only 'unpardonable sin' (Mark 3:28) - it is, I think, necessary to link it to this verse in Isaiah.
Jesus did not only warn of 'millstones' but made it abundantly clear that there would be no possibility of forgiveness for Judas.
Why not, I wonder?
I have a suggestion which will not be accepted by some Christians but I fervently believe that there is a clear distinction between 'sin' and 'evil'.
The latter is always the former but the former is not necessarily the latter.
I do not wish to go along the route of 'mortal' and 'venial' sins which is specious but the idea is not totally without merit.
Now consider our godless society and what it permits. Consider the 'evils' which it considers 'good'.
Worrying ain't it?