http://www.is.wayne.edu/mnissani/santiago/RUSSELL.htm
Bertrand Russell talks about how, even in the greatest truth of thruths, a yard is still 3 feet. Something like that.
Predication could simply mean language, as Russell is a famous philosopher of language, or it could be referencing the fact that Russell is a famous logician.
Looks to me that Brad is just making a comment about Para's complaints about his language. He's not limiting himself to some standard language, because standard ways just come up short.
I defy anyone to come up with a better explanation than that