You do not know the appearance of <a rock buried in the ground>.
Dig out the rock completely, then look at it in detail.
You will know the rock most perfectly then.
With <a human being> too, at first you do know what that person is like.
Look at him in detail after he has finished the work he must do.
That is how to know him most perfectly.
Likewise, there is hardly anyone who knows <what happens after they die>.
If you are curious, then look in detail when 'that day' comes.
That is the most perfect way to know.
