So the statement ["The cat is on the mat" ] is liable to the insincerity form of infelicity; or even to the breach form of infelicity in this sense, that saying or stating that the cat is on the mat commits me saying or stating "The mat is underneath the cat" just as much as the performative "I define X asY" (...) commits me to using those terms in special ways in future discourse, and we can see how this is connected with such acts as promising.