Deeply Disagreeing with Myself: Synchronic Intrapersonal Deep Disagreements


Interpersonal disagreement happens all the time. How to properly characterize interpersonal disagreement and how to respond to it are important problems, but the existence of such disagreements at least is obvious. The existence of intrapersonal disagreement, however, is another matter. On the one hand, we do change our minds sometimes, especially when new evidence comes in, and so there is a clear enough sense in which we can be characterized as having disagreements with our past selves. But what about synchronic disagreements with ourselves? Are such cases possible, or is there something about the nature of belief that rules out the possibility of knowingly holding beliefs which cannot be rationally held at the same time? In this paper, I argue that there can be cases of intrapersonal synchronic disagreement, and that such disagreements can be deep, in the same way that interpersonal disagreements can be deep. For intrapersonal disagreements, just like interpersonal disagreements, can be grounded in conflicting frameworks for interpreting and reasoning about the world. I also argue that synchronic intrapersonal disagreements are peer disagreements. The paper ends with a discussion of four possible responses to interpersonal deep disagreements, concluding that if those responses are sometimes rational responses in the interpersonal case, then they are also sometimes rational responses in the intrapersonal case.

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  1. 1.

    On merely verbal disputes, see Jenkins (2014).

  2. 2.

    On the no-rational-co-tenability view of disagreement, see McFarlane (2014, Sect. 6.2), and Coliva (2019, esp. p. 10).

  3. 3.

    Lynch (2013) similarly characterizes cases of changing one’s mind as cases of diachronic intrapersonal disagreement, and in cases where the change involves adopting a new fundamental epistemic principle, he imagines the later time-slice of a person as attempting to offer reasons to the earlier time-slice. But Lynch is not committed, as far as I know, to the possibility of synchronic intrapersonal disagreement.

  4. 4.

    As the case plays out, Jane comes to realize that she has been behaving as though she does not trust Jim, and so she attributes to herself, third-personally, the belief that Jim is unfaithful. So, Coliva notes, Jane can coherently assert “I believe Jim is unfaithful, although he is not.” Whereas that assertion would normally be Moore-paradoxical, in this case it is not.

    The felicity of Jane’s assertion in this case seems clear. But note that the felicity of Jane’s assertion does not presuppose that Jane is correct in attributing to herself the belief that Jim is unfaithful. Jane’s assertion only works because she is providing a third-personal interpretation of her belief-set in light of her patterns of behaviour—and third-personal attributions of mental states are fallible, even when directed toward oneself.

  5. 5.

    Compare Anselm’s aim in the Proslogion to provide rational arguments for God’s existence, not because he ever doubted God’s existence, but rather because he thought that rational arguments can deepen his understanding of God’s existence and nature.

  6. 6.

    e.g., Mackie (1955) and Rowe (1979).

  7. 7.

    Hick (1990).

  8. 8.

    Schlesinger (1964, 1977).

  9. 9.

    e.g., Wykstra (1984; 2007) and Bergmann (2001).

  10. 10.

    See also Adler (2001) on the claim that rationality is constitutive rather than regulatory for belief.

  11. 11.

    See Bondy (2018), where I have argued that it is possible to hold beliefs against what one judges to be good evidence. See also McCormick (2015).

  12. 12.

    Note that because Fred recognizes that this set of beliefs is inconsistent, he needs to reason paraconsistently in order to avoid explosion of his belief-system. But unless Fred is a logician he’s probably not bothered very much by that. Again, the point isn’t that Fred is a paradigm of a rational person; the point is only that he seems like a perfectly ordinary, psychologically plausible person.

    As Coliva notes, dialetheism is not going to help a person like Fred. He doesn’t think that there are true contradictions; he just doesn’t know which proposition in the inconsistent set to give up. For an approach to paraconsistent logic without dialetheism, see Carnielli and Rodrigues (2019).

  13. 13.

    For useful discussions of peerhood and peer disagreement, see Feldman (2006), Kelly (2005), Lackey (2010), King (2012) and Siegel (2013).

  14. 14.

    See Frances (2010) and Frances and Cocchiario (2019) for the claim that (rationally) acknowledged peerhood, even if the acknowledgment is mistaken, is what really matters in cases of peer disagreement.

  15. 15.

    Many of the essays in this volume offer further useful discussion of the nature of deep disagreements, including ways to categorize different kinds of deep disagreements. See, for instance, Martin (2019), Kappel (2018), Kloster (2018), Simard Smith and Lynch (2020), and Ranalli (2018).

  16. 16.

    See Godden and Brenner (2010) for the suggestion that arguments by analogy can make it rational for a participant in an argument to adopt a revised conceptual scheme and its associated revised inference rules. Similarly, Shields (2018) sees deep disagreements as disagreements about how certain concepts should be understood, and he argues that assertions in deep disagreements are more stipulative than descriptive.

  17. 17.

    Whereas Anselm (1965) takes the idea of God to be the idea of a being than which no greater can be conceived, perhaps Fred can take the idea of God to be the idea of a being than which no greater actually exists.

  18. 18.

    Aikin (2018), for example, defends a Dialecticality Requirement which is consistent with this sort of argument strategy.

  19. 19.

    See Bondy (2019) for more on the epistemic norm of inference and argument.

  20. 20.

    See Lynch (2010, 2013) and Simard Smith and Lynch (2020).

  21. 21.

    See Alston (1993), Kornblith (2009), Bergmann (2006), and Alexander (2011) for defenses of epistemic circularity.


  1. Adler J (2001) Belief’s own ethics. MIT Press, Cambridge

    Google Scholar 

  2. Aikin S (2018) Deep disagreement and the problem of the criterion. Topoi.

    Article  Google Scholar 

  3. Alexander D (2011) In defense of epistemic circularity. Acta Anal 26(3):223–241

    Article  Google Scholar 

  4. Alston W (1993) The reliability of sense perception. Cornell University Press, Ithaca/London

    Google Scholar 

  5. Anselm (1965) St. Anselm’s Proslogion. Trans. M.J. Charlesworth. University of Notre Dame Press, Notre Dame

  6. Bergmann M (2001) Skeptical theism and Rowe’s new evidential argument from evil. Noûs 35(2):278–296

    Article  Google Scholar 

  7. Bergmann M (2006) Justification without awareness: a defense of epistemic externalism. Clarendon, Oxford

    Google Scholar 

  8. Bondy P (2014) Epistemic circularity, reliabilism, and transmission failure. Episteme 11(3):335–348

    Article  Google Scholar 

  9. Bondy P (2018) Epistemic rationality and epistemic normativity. Routledge, New York

    Google Scholar 

  10. Bondy P (2019) The epistemic norm of inference and non-epistemic reasons for belief. Synthese.

    Article  Google Scholar 

  11. Carnielli W, Rodriguez A (2019) An epistemic approach to paraconsistency: a logic of evidence and truth. Synthese 196(9):3789–3813

    Article  Google Scholar 

  12. Coliva A (2019) Disagreeing with myself. A Philos Q 56(1):1–13

    Google Scholar 

  13. Feldman R (2006) Epistemological puzzles about disagreement. In: Hetherington S (ed) Epistemology futures. Oxford University Press, New York

    Google Scholar 

  14. Fogelin R (1985) The logic of deep disagreements. Inf Log 7:1–8. Reprinted: (2005) Inf Log 25:3–11

  15. Frances B (2010) The reflective epistemic renegade. Philos Phenom Res 81:419–463

    Article  Google Scholar 

  16. Frances B, Cocchiaro Z (2019) Epistemically different epistemic peers. Topoi.

    Article  Google Scholar 

  17. Godden D, Brenner W (2010) Wittgenstein and the logic of deep disagreement. Cogency 2:41–80

    Google Scholar 

  18. Hick J (1990) Philosophy of religion, 4th edn. Prentice-Hall, Englewood Cliffs

    Google Scholar 

  19. Jenkins C (2014) Merely verbal disputes. Erkenntnis 79:11–30

    Article  Google Scholar 

  20. Kappel K (2018) Higher order evidence and deep disagreement. Topoi.

    Article  Google Scholar 

  21. Kelly T (2005) The epistemic significance of disagreement. In: Gendler TS, Hawthorne J (eds) Oxford studies in epistemology, vol 1. Oxford University Press, Oxford

    Google Scholar 

  22. King N (2012) Disagreement: what’s the problem? Or a good peer is hard to find. Philos Phenom Res 85(2):249–272

    Article  Google Scholar 

  23. Kloster M (2018) Another dimension to deep disagreements: trust in argumentation. Topoi.

    Article  Google Scholar 

  24. Kornblith H (2009) A reliabilist solution to the problem of promiscuous bootstrapping. Analysis 69(2):263–267

    Article  Google Scholar 

  25. Lackey J (2010) A justificationist view of disagreement’s epistemic significance. In: Haddock A, Millar A, Pritchard D (eds) Social epistemology. Oxford University Press, Oxford

    Google Scholar 

  26. Lynch M (2010) Epistemic disagreement and epistemic incommensurability. In: Haddock A, Miller A, Pritchard D (eds) Social epistemology. Oxford University Press, Oxford

    Google Scholar 

  27. Lynch M (2013) Epistemic commitments, epistemic agency, and practical reasons. Philos Issues 23:343–362

    Article  Google Scholar 

  28. Macfarlane J (2014) Assessment sensitivity: relative truth and its applications. Oxford University Press, Oxford

    Google Scholar 

  29. Mackie JL (1955) Evil and omnipotence. Mind New Ser 64(254):200–212

    Article  Google Scholar 

  30. Martin B (2019) Searching for deep disagreement in logic: the case of dialetheism. Topoi.

    Article  Google Scholar 

  31. McCormick M (2015) Believing against the evidence. Routledge, New York

    Google Scholar 

  32. Parfit D (1971) Personal identity. Philos Rev 80(1):3–27

    Article  Google Scholar 

  33. Ranalli C (2018) What is deep disagreement? Topoi.

    Article  Google Scholar 

  34. Rowe W (1979) The problem of evil and some varieties of atheism. Am Philos Q 16(4):335–341 Reprinted In: Howard-Snyder D (ed) (1996) The evidential argument from evil. Indiana University Press, Bloomington and Indianapolis

  35. Schlesinger G (1964) The problem of evil and the problem of suffering. Am Philos Q 1(3):244–247

    Google Scholar 

  36. Schlesinger G (1977) Religion and scientific method. Reidel, Dordrecht

    Google Scholar 

  37. Shields M (2018) On the pragmatics of deep disagreement. Topoi.

    Article  Google Scholar 

  38. Siegel H (2013) Argumentation and the epistemology of disagreement. Cogency 5(1):135–170

    Google Scholar 

  39. Simard Smith P, Lynch M (2020) The varieties of deep epistemic disagreement. Topoi.

    Article  Google Scholar 

  40. Wykstra S (1984) The Humean obstacle to evidential arguments from suffering: on avoiding the evils of “appearance”. Int J Philos Religion 16(2):73–93

    Article  Google Scholar 

  41. Wykstra S (2007) CORNEA, Carnap, and current closure befuddlement. Faith Philos 24(1):87–98

    Article  Google Scholar 

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Many thanks to David Godden for valuable discussion of this paper, and to two anonymous referees for this journal for their insightful feedback on a previous draft.

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Correspondence to Patrick Bondy.

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Bondy, P. Deeply Disagreeing with Myself: Synchronic Intrapersonal Deep Disagreements. Topoi (2020).

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  • Disagreement
  • Deep disagreement
  • Peer disagreement
  • Intrapersonal disagreement
  • Belief
  • Rational resolutions
  • Argumentation
  • Epistemic rationality