We tend to only recognize the things we got wrong when we change our mind.
It would "suck" to meet the Lord and find out we got too much wrong. (Depart from Me I never knew you)
But, the nice aspect about being Reformed is you don't have to depend upon yourself to get it right in order to enter heaven.
I understand, however I believe God will rectify and correct foundational errors of His Gospel Truth in all His Elect, they have been given an unction from Him 1 Jn 2:18-21,27
18 Little children, it is the last time: and as ye have heard that antichrist shall come, even now are there many antichrists; whereby we know that it is the last time.
19 They went out from us, but they were not of us; for if they had been of us, they would no doubt have continued with us: but they went out, that they might be made manifest that they were not all of us.
20
But ye have an unction from the Holy One, and ye know all things.
21 I have not written unto you because ye know not the truth, but because ye know it, and that no lie is of the truth.
27
But the anointing which ye have received of him abideth in you, and ye need not that any man teach you: but as the same anointing teacheth you of all things, and is truth, and is no lie, and even as it hath taught you, ye shall abide in him.
