Deductive Logic Quotes & Sayings

Theologians, and religionists in general, start with a fantasy premise and then proceed to apply rigorous formal logic to tease out its implications. Stark himself points out that "theology consists of formal reasoning about God." This is admirably exact. Theologians, beginning with a wished-for creation of their own minds, analyze that creation's characteristics by rigorous application of the principles of formal - that is, deductive - logic. — Andrew Bernstein

The word 'proof' should strictly only be used when we are dealing with deductive inferences.... Popper claimed that scientists only need to use deductive inferences.... So if a scientist is only interested in demonstrating that a given theory is false, she may be able to accomplish her goal without the use of inductive inferences.... When a scientist collects experimental data, her aim might be to show that a particular theory...is false. She will have to resort to inductive reasoning.... So Popper's attempt to show that science can get by without induction does not succeed. — Samir Okasha

No discussion of logic is complete without a refresher course in the difference between inductive and deductive reasoning. By its strictest definition, inductive reasoning proves a general principle - your idea worth spreading - by highlighting a group of specific events, trends, or observations. In contrast, deductive reasoning builds up to a specific principle - again, your idea worth spreading - through a chain of increasingly narrow statements. — Jeremey Donovan

One thing is funny because my grandparents are going to come see the show and my mom was concerned that they wouldn't understand, because so much of it is Internet-based. Our generation specifically really relates to it, because we were the first people to discover the Internet and most of us can maybe navigate the Internet better than our parents can. All this information you could ever possibly know is right at our fingertips, not to mention the fact you can meet anyone! — Sarah Steele

Some things cannot be perceived with the five senses; they can only be conceived by the Holy Spirit. Some things cannot be deduced via deductive reasoning; they can only be imagined by the Holy Spirit. Some things cannot be learned by logic; they can only be revealed by the Holy Spirit. — Mark Batterson

If a lack of empirical foundations is a defect of the theory of logical probability, it is also a defect of deductive logic. — David Stove

Our society's almost doctrinal emphasis upon deductive reasoning, convergent thinking and selective retention perversely excludes divergent thinking, approximation and, importantly, guessing. If we are truly to understand the adolescent mind and develop effective ways to minimize the effects of risk-taking behaviour, we really need to understand these processes and engage with them. There is no logic involved with drug-taking and gambling. Adults can learn, too; understanding these mechanisms will also allow us to encourage creativity and value the spontaneity so characteristic of the adolescent mind. — Tony Little

It was a good answer that was made by one who when they showed him hanging in a temple a picture of those who had paid their vows as having escaped shipwreck, and would have him say whether he did not now acknowledge the power of the gods, - 'Aye,' asked he again, 'but where are they painted that were drowned after their vows?' And such is the way of all superstition, whether in astrology, dreams, omens, divine judgments, or the like; wherein men, having a delight in such vanities, mark the events where they are fulfilled, but where they fail, though this happens much oftener, neglect and pass them by. — Francis Bacon

Todd, trust math. As in Matics, Math E. First-order predicate logic. Never fail you. Quantities and their relation. Rates of change. The vital statistics of God or equivalent. When all else fails. When the boulder's slid all the way back to the bottom. When the headless are blaming. When you do not know your way about. You can fall back and regroup around math. Whose truth is deductive truth. Independent of sense or emotionality. The syllogism. The identity. Modus Tollens. Transitivity. Heaven's theme song. The night light on life's dark wall, late at night. Heaven's recipe book. The hydrogen spiral. The methane, ammonia, H2O. Nucleic acids. A and G, T and C. The creeping inevibatility. Caius is mortal. Math is not mortal. What it is is: listen: it's true. — David Foster Wallace

I am delighted to know that Principia Mathematica can now be done by machinery ... I am quite willing to believe that anything in deductive logic can be done by machinery. — Bertrand Russell

Little John: Look, why don't ya stop moanin' and mopin' around? Just marry the girl.
Robin Hood: Marry her? You don't just walk up to a girl, hand her a bouquet and say, "Hey, remember me? We were kids together. Will you marry me?" No, it just isn't done that way.
Little John: Ah, come one, Robby. Climb the castle walls. Sweep her off her feet. Carry her off in style.
Robin Hood: It's no use, Johnny. I've thought it all out, and it just wouldn't work. Besides, what have I got to offer her?
Little John: Well, for one thing, you can't cook.
Robin Hood: I'm serious Johnny. She's a highborn lady of quality.
Little John: So she's got class. So what?
Robin Hood: I'm an outlaw. That's what. That's no life for a lovely lady. Always on the run. What kind of a future is that? — Me

There is nothing distinctively scientific about the hypothetico-deductive process. It is not even distinctively intellectual. It is merely a scientific context for a much more general stratagem that underlies almost all regulative processes or processes of continuous control, namely feedback, the control of performance by the consequences of the act performed. In the hypothetico-deductive scheme the inferences we draw from a hypothesis are, in a sense, its logical output. If they are true, the hypothesis need not be altered, but correction is obligatory if they are false. The continuous feedback from inference to hypothesis is implicit in Whewell's account of scientific method; he would not have dissented from the view that scientific behaviour can be classified as appropriately under cybernetics as under logic. — Peter Medawar

Without deductive logic science would be entirely useless. It is merely a barren game to ascend from the particular to the general, unless afterwards we can reverse the process and descend from the general to the particular, ascending and descending like angels on Jacob's ladder. — Alfred North Whitehead

There are enough scary rock & roll mothers in the world. — Tori Amos

I FEEL THE MOST ALIVE WHEN I'M SINGING. I ALSO GET TO BE THE MAIL MAN FOR SOME OF THE MOST BEAUTIFUL LYRICS EVER WRITTEN. — Mandy Patinkin

He gave a nod. "My future lies in your hands."
"Not your future, Gerard, but the path leading to it," she suggested — Jettie Necole

I've taken my bumps and bruises, but you've got to be willing to get knocked down and pick yourself up. You can't get discouraged. You can't lose sight of what your goals are. — Jermaine O'Neal

Inferences of Science and Common Sense differ from those of deductive logic and mathematics in a very important respect, namely, when the premises are true and the reasoning correct, the conclusion is only probable. — Bertrand Russell