'This careful and sophisticated study provides powerful empirical evidence, from many sources, for logical nativism, the thesis that human languages make use of the logical concepts and laws of classical logic, and that these are contingent facts that are not learned and not required for a rational creature. It extends the conclusion to other aspects of natural language, its acquisition and use. The conclusions are compelling, and of great import for linguistics, philosophical logic, and psychology of language and mind quite generally.' Noam Chomsky, Massachusetts Institute of Technology