Something occurs to me: Different people understand the same words differently. So, for example, to my parents, "therapy" might be a self-indulgent activity that only weak people engage in. To me, therapy might be a meaningful activity designed to strengthen myself. Now, if my parents ask me: "are you in therapy", and I knew their understanding of the word, it occurs to me that I would not be lying by saying "no". No - I am not engaged in a self-indulgent activity that only weak people engage in. Now, if what I've said is true, it would seem to have implications for logic. The "if p then q" universe seems threatened or at least loosened if neither "p" nor "q" meant the same thing to everyone. 1) To what extent would my presuppositions entail a weakening of the importance of logic? 2) To what extent are my ideas correct? 3) Is there any reading I can do on this topic?