They think they are on a journey yo self enlightenment when they're actually in a very dangerous road to spiritual weakness, causing damage to their souls and leaving gaps to be used by entities that they'll not feel any pleasure of knowing.

That sense of impeding doom is nothing more than those spiritual entities oppressing with overwhelming power them by those gaps.

We are locked out of that world for a reason. The safe means to get unlocked is by getting your soul to borrow the power of God and slowly expose yourself to such world. Other than that, self enlightenment is just wishful thinking of empty vessels.