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Single Idea 19307

[filed under theme 2. Reason / A. Nature of Reason / 1. On Reason ]

Full Idea

We sometimes discover our views are inconsistent and do not know how to revise them in order to avoid inconsistency without great cost. The best response may be to keep the inconsistency and try to avoid inferences that exploit it.

Gist of Idea

If there is a great cost to avoiding inconsistency, we learn to reason our way around it

Source

Gilbert Harman (Change in View: Principles of Reasoning [1986], 2)

Book Ref

Harman,Gilbert: 'Change in View: Principles of Reasoning' [MIP 1986], p.15

A Reaction

Any decent philosopher should face this dilemma regularly. I assume non-philosophers don't compare the different compartments of their beliefs very much. Students of non-monotonic logics are trying to formalise such thinking.

The 34 ideas with the same theme [general role of reason in mind and living]:

1502 Parmenides was much more cautious about accepting ideas than his predecessors [Simplicius on Parmenides]
243 It is foolish to quarrel with the mind's own reasoning processes [Plato]
224 When questions are doubtful we should concentrate not on objects but on ideas of the intellect [Plato]
11283 There is pure deductive reasoning, and explanatory demonstration reasoning [Aristotle, by Politis]
23250 Desired responsible actions result either from rational or from irrational desire [Aristotle]
2676 Didactic argument starts from the principles of the subject, not from the opinions of the learner [Aristotle]
1848 We are coerced into assent to a truth by reason's violence [Aquinas]
22708 Good reasons must give way to better [Shakespeare]
13009 A reason is a known truth which leads to assent to some further truth [Leibniz]
16897 Reason is the faculty for grasping apriori necessary truths [Leibniz, by Burge]
6253 Reason is our power of finding out true propositions [Hutcheson]
5604 In reason things can only begin if they are voluntary [Kant]
5622 The boundaries of reason can only be determined a priori [Kant]
5623 If I know the earth is a sphere, and I am on it, I can work out its area from a small part [Kant]
21416 Philosophers should not offer multiple proofs - suggesting the weakness of each of them [Kant]
21974 The world seems rational to those who look at it rationally [Hegel]
7083 Highest reason is aesthetic, and truth and good are subordinate to beauty [Hegel]
17892 For clear questions posed by reason, reason can also find clear answers [Gödel]
23945 Reason is actually passions, guided by perspicacious reflection [Solomon]
3811 Entailment and validity are relations, but inference is a human activity [Searle]
3822 Theory involves accepting conclusions, and so is a special case of practical reason [Searle]
19304 The rules of reasoning are not the rules of logic [Harman]
19306 It is a principle of reasoning not to clutter your mind with trivialities [Harman]
19307 If there is a great cost to avoiding inconsistency, we learn to reason our way around it [Harman]
19309 Logic has little relevance to reasoning, except when logical conclusions are immediate [Harman]
6950 You can be rational with undetected or minor inconsistencies [Harman]
3099 Inference is never a conscious process [Harman]
23249 The early philosophers thought that reason has its own needs and desires [Frede,M]
9429 Many forms of reasoning, such as extrapolation and analogy, are useful but deductively invalid [Mumford]
4767 Traditionally, rational beliefs are those which are justified by reasons [Psillos]
20955 Art can make reason more all-inclusive, by articulating what seemed inexpressible [Bowie]
5750 Consistency is modal, saying propositions are consistent if they could be true together [Melia]
6585 Rationality is threatened by fear of inconsistency, illusions of absolutes or relativism, and doubt [Fogelin]
8952 We reach 'reflective equilibrium' when intuitions and theory completely align [Fisher]