well, goombah, the original idea was case re-stating what he saw as teaspoon's rational for understanding things
1. The physical senses provide trustworthy information about reality
teaspoon was citing reasons for understanding that reality existed.
my point was that physical senses are not essential for providing trustworthy information about reality. i believe that one can think about ideas without using a physical reference, including physical symbols.
you can't use your senses to demonstrate the difference between "logical" and "illogical," for instance. but i can think through ideas and come to conclusions about reality without leaving the realm of the idea.
all A is B
all B is C
all A is C
is this argument true or false? you don't have to refer to any physical references to decide. there are two boundaries of separation here, and you can perceive them without your senses. you may want to use a physical example to make it clear to yourself, but the relationships don't require anything to be perceived by your senses.
what understanding could I have of 'separation' if I'd never seen or heard separate things?I can apply 'separate' to thought because I have already learned the concept of separation through my physical senses.
"separation" is the general condition, and "things determined to be separate through my physical senses" is a special case. you would never have understood how things could be separated by your physical senses if you didn't already have an understanding of what "separate" meant.
we're so used to understanding things in a sensory way that we forget that understanding something is a mental process. we then use the physical references as aids to explain or remember it, but understanding doesn't need the physical.
ever understood something in a dream so clearly that you wopndered how you ever culd have missed it, and then when you wke up after a while you couldn't understand it anymore? your subconscious is processing information at a level so far removed from your daily life that you can't even understand it anymore until you dream again. then it comes right back.