Pleasure and Joy

[Captain Colostomy]

Of course, but if the knowledge is unverifiable, then it is useless and considered unreasonable. One can have all the personal knowledge he wishes in regards to unicorns, but it does not mean that unicorns exists.

I have personal knowledge of what red looks like to me. This knowledge is neither useless nor unreasonable. I also have personal knowledge of the existence of my mind-- something you cannot have, unless you want to define mind in purely physical terms (i.e. brain function).

You're picking at nits here.