The Game of Logic

„The world contains many THINGS (such as «Buns», «Babies», «Beetles», «Battledores», &c.); and these Things possess many ATTRIBUTES (such as «baked», «beautiful», «black», «broken», &c.: in fact, whatever can be «attributed to», that is «said to belong to», any Thing, is an Attribute). Whenever we wish to mention a Thing, we use a SUBSTANTIVE: when we wish to mention an Attribute, we use an ADJECTIVE.”

„You will find these seven words — PROPOSITION, ATTRIBUTE, TERM, SUBJECT, PREDICATE, PARTICULAR, UNIVERSAL — charmingly useful, if any friend should happen to ask if you have ever studied Logic. Mind you bring all seven words into your answer, and your friend will go away deeply impressed — «a sadder and a wiser man».”

„The word «some», in Logic, means «one or more».”

„Remember, I don't guarantee the Premisses to be FACTS. In the first place, I never even saw a Dragon: and, in the second place, it isn't of the slightest consequence to us, as LOGICIANS, whether our Premisses are true or false: all WE have to do is to make out whether they LEAD LOGICALLY TO THE CONCLUSION, so that, if THEY were true, IT would be true also.”

„If you meet with Syllogisms of this kind, you may work them quite easily by the system I have given you: you have only to make «are» mean «are CAPABLE of being», and all will go smoothly. […] In using the Diagrams for this system, you must understand a red counter to mean «there may POSSIBLY be something in this compartment», and a grey one to mean «there cannot POSSIBLY be anything in this compartment».”