Logic requires noncontradictory identification within the full context of one's knowledge, methodically surveyed; it requires an understanding of the fact that knowledge is a unity, not a realm of splintered propositions or disconnected subdivisions.
Spock: You have to shoot. If you are logical, you have to shoot. Lt. Valeris: I do not want to. Spock: What you want is irrelevant. What you have chosen is at hand. Kirk: I’d just as soon you didn’t.
Samantha Booke (Jurnee Smollett): Without welfare Mr. Tolson, people would be starving. Melvin B. Tolson (Denzel Washington): Who is starving Ms. Booke? Samantha Booke (Jurnee Smollett): The unemployed are starving. Melvin B. Tolson (Denzel Washington): Mr. Burgess here. He's unemployed. Obviously he's not starving. I drew you in Ms. Booke. You gave a faulty premise so your syllogism fell apart. Samantha Booke (Jurnee Smollett): Syllogism? Melvin B. Tolson (Denzel Washington): Your logic fell apart. Major premise: the unemployed are starving, minor premise Mr. Burgess is unemployed. Conclusion...Mr. Burgess is starving. Your major premise was based on a faulty assumption. Classic fallacy.