Full Idea
The standard two-valued semantics for classical logic involves a conception under which to grasp the meaning of a sentence is to apprehend the conditions under which it is, or is not, true.
Gist of Idea
Classical two-valued semantics implies that meaning is grasped through truth-conditions
Source
Michael Dummett (The Justification of Deduction [1973], p.305)
Book Reference
Dummett,Michael: 'Truth and Other Enigmas' [Duckworth 1978], p.305
A Reaction
The idea is that you only have to grasp the truth tables for sentential logic, and that needs nothing more than knowing whether a sentence is true or false. I'm not sure where the 'conditions' creep in, though.