Grice on "that is to say" as redundant for "that is" (WoW: 367)

--- by J. L. Speranza,
------- for the Grice Club.

I WOULD SUBMIT that

every occurrence of

'that is to say'

is best summarised to

'that is'.

Example:

Grice:

WoW: 367:

He is speaking of Hare, without mentioning him ("how NOT to run with the hare and hunt with the hounds"), and he speaks unashamedly of the phrastics and the neustics, forgetting the tropics, and the clistics, and adds, Grice does:

"Philosophers, that is to say, who in representing the structure of discourse"

make some fine distinctions.

In what way is that different form the more Aristotelian ('to be is said in many ways'):

"Philosophers, that is, who in representing the structure of discourse"

make some fine distinctions? No way!