sentences:  Whereas bad skepticism presumes the impossibility of understanding, good skepticism encourages a healthy distrust of language and systematization.While bad pragmatism subjugates belief entirely to one's own will, good pragmatism regulates belief by acknowledging one's ignorance.One of Vaz Ferreira's fundamental concepts is "Living Logic" ("Lógica Viva") or "Psycho-Logic" ("Psico-Lógica"), which he began to develop after completing "The Problems of Liberty".