We are either in Christ or not.
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Jesus said to his father l have kept all those you have given me
except Judas.
Once saved always saved, not sure, some things I know that I do not
completely understand, other things I believe I understand but so does
every one else who may understand it different.
In other words I realize I can be wrong.
It’s written, (with certainty) , that we can ‘Know’ we have Eternal life. The Lord wants us to be assured we do indeed have Eternal life....I don’t think it’s a matter of understanding but believing what ‘He has said’... And that faith to believe “cometh by hearing, and hearing by the word of God”...
“These things have I written ‘unto you that believe’ on the name of the Son of God; that ye may ‘KNOW’ that ye have eternal life’...1 John 5
As for Judas.....we see that Satan entered Judas in Luke 22:3 After that point (in John 17), Jesus calls Judas the “son of destruction”. .....Judas made a conscious effort/choice to betray Jesus when he went to the chief priests and the officers of the temple guard and discussed with them how he might betray Jesus ..he consented to being paid and watched for opportunity to betray Jesus.