“Personal revelation” just means defining God, morality, right and wrong, and good and evil for yourself as you judge to be fit.
Somewhere I read something about a famous personage saying we could do this...
oh, yeah, Genesis 3:5. Satan. “you will be as gods, knowing good and evil”
Far more often than not that is exactly what it amounts to.
Do I believe God can speak to me through His word? Of course, but if what I believe counters the Bible then it is not from God.