What are the philosophic concepts of the deaf-mute? What are his or her metaphysical imaginings?
All philosophic acts, every attempt to think thought, with the possible exception of formal (mathematical) and symbolic logic, are irremediably linguistic. They are realized and held hostage by one motion or another of discourse, of encoding in words and in grammar. Be it oral or written, the philosophic proposition, the articulation and communication of argument are subject to the executive dynamics and limitations of human speech.
–by George Steiner