CANON XVI.-If any one saith, that he will for certain, of an absolute and infallible certainty, have that great gift of perseverance unto the end - unless he have learned this by special revelation ; let him be anathema.
We are, as I understand it, to “work out our salvation in fear and trembling,” so can not know until we die. We can have a level of confidence in our eternal destiny through the Sacraments and how we live I think… the goal is to die “in a state of grace” as I personally see it.
So in direct reply to the question, no we can not.
One thing I’m confident of though is, I will be judged on what I’ve done right, not what I believed or thought, or said was right.
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