[annalex]

My premise is that in Catholicism "assurance" does not mean "to be sure". Instead, and notwithstanding your explanation that avoidance of mortal sin is achievable (but how many succeed?), it really refers to a temporary or fleeting state. One can be absolutely sure in a particular instant, but have no assurance concerning 5 minutes from now. To me, that is no assurance at all.

I know that it seems untherapeutic. However, it is entirely up to your free will to sin or not to sin. Don't sin, and bingo, absolute assurance. As St. Francis said, sainthood is easy: all you need to do is want it.

[Full Court]

Don't sin, and bingo, absolute assurance.

Why is your salvation based on what you do, not what Jesus did for you?