from what we see, I do not know every thing and you as well, and at the same time me and you know the same things and example is when you put salt on the food it will be salty.
What suits me Thelonius may not suit you and vice versa.
"The question remains: who KNOWS what is right or wrong?"
The people who experience things, feel it, practice it, and see the results are the people who knows what is right or wrong?
If I gave you a metalic can which is not transparent and there is writing on it how you will know if it is orange juice or pepsi?
You might ask some one, ok what will you do if you did not find any one who can answer you? you will open the taste what is inside.
You will not know the taste of a fruit if you did not taste it.