How do the things mentioned in the title hang together? – Read on, then! Think about this well known illusion: You see a stick in the water; the stick seems to be bent. What can you do to check whether it is really bent? – Knowing that water influences visual perception, you can change the conditions: You take it out of the water and realise that it is straight. Taking it out also allows for confirmation through a different sense modality: Touching the stick, you can compare the visual impression with the tactile one. Checking sense modalities and/or conditions against one another establishes an agreement in judgment and thus objectivity. If you only had the visual impression of the stick in the water, you could not form an objective judgment. For all you knew, the stick would be bent.
Now, objectivity is nice to have. But it requires a crucial presupposition that we have not considered so far: that the different perceptions are perceptions of the same thing. Identity assumptions about perceptual objects come easily. But, in principle, they could be challenged: How do you know that what you touch really is the same thing as the one you feel? Normally, yes: normally, you don’t ask that question. You presuppose that it’s the same thing. Of course, you might theorise about a wicked friend exchanging the sticks when you aren’t looking, but this is not the issue now. We need that presupposition; otherwise our world would fall apart. Cutting a long story short, to ‘have’ our world we need at least two things, then: (1) agreement in our tacit judgments (about perceptions) and agreement with the judgments of others: So when someone says it’s raining that judgment should agree with our perceptual judgments: “it’s raining” must agree with the noise we hear of the drops hitting the rooftop and the drops we see hitting the window; (2) and we must presuppose that all these judgments concern the same thing: the rain.
Now all hell breaks loose when such judgments are consistently challenged. What is it I hear, if not the rain? What do you mean when you say “it’s raining”, if not that it’s raining? Are you talking figuratively? Are you not sincere? – One might begin to distrust the speaker or even one’s senses (or the speaker’s senses). It might turn out that the sameness was but a presupposition. (Oh, and what guided the comparison between touch and vision in the first place? How do I know what it feels like to touch a thing looking like ‘that’? Best wishes from Mr Molyneux …)
Presuppositions about sameness and challenging them: this provides great plots for stories about love, crime, sincerity and normality. I leave it to your imagination to fill in the gaps now. Assumptions about sameness figure in judgments about sincerity, about objects, persons, about perceptions, just about everything. (Could it turn out that the Morning Star is not the Evening Star, after all?) It’s clear that we need such assumptions if we don’t want to go loopy, and it’s palpable what might happen if they are not confirmed. Disagreement in judgment can hurt and upset us greatly.
No surprise then that we read philosophical texts with similar assumptions. If your colleague writes a text entitled “on consciousness” or “on justice” you make assumptions about these ideas. Are these assumptions confirmed when you pick up a translation: “De conscientia” or “Über Bewusstsein”? Hmmm, does the Latin match? Let’s see! What you look for, at least when your suspicion is raised, is confirmation about the topic: Does it match what you take consciousness to be? But hang on! Perhaps you should check your linguistic assumptions first? Is it a good translation?
What you try to track is sameness, by tracking agreement in judgments about different kinds of facts. Linguistic facts have to match. But also assumptions about the topic. Now a new problem emerges: It might be that the translation is a match, but that you genuinely disagree with your colleage about what consciousness is. Or it might be that you agree about consciousness, but that the translation is incorrect. – How are you going to find out which disagreement actually obtains? – You can ask your colleage: What do you mean by “conscientia”? She then tells you that she means that conscientia is given if p and q obtain. You might now disagree: I think consciousness obtains when p and r obtain. Now you have a disagreement about the criteria for consciousness. – Really? Perhaps you now have disagreement of what “consciousness” means or you have a disagreement of what “conscientia” means. How do you figure that out? Oh, look into a canonical book on consciousness! – Let’s assume it even notes certain disagreements: What are the disagreements about?
I guess the situation is not all that different when we read historical texts. Perhaps a bit worse actually. We just invoke some more ways of establishing sameness: the so-called context. What is context? Let’s say we invoke a bunch of other texts. So we look at “conscientia” in Descartes. Should we look at Augustine? Some contemporaries? At Dennett? At some scholastic authors? Paulus? The Bible? How do we determine which context is the right one for establishing sameness. And is consciousness even a thing? A natural kind about which sameness claims can be well established? – Oh, and was Descartes sincere when he introduced God in the Meditations?
Sometimes disagreements among historians and philosophers remind me of the question which interpretation of a piece of music is the proper one. There is a right answer: it’s whichever interpretation you’ve listened to first. Everything else will sound more or less off, different in any case. That’s where all your initial presuppositions were rooted. Is it the same piece as the later interpretations? Is it better? How? Why do I like it? How do I recognise it as the same or similar? And I need a second coffee now!
I reach to my cup and find the coffee in there lukewarm – is it really my coffee, or indeed coffee?
Whilst I’m at it: Many thanks to all the students in my course on methodology in the history of philosophy, conveniently called “Core Issues: Philosophy and Its Past”. The recent discussions were very intriguing again. And over the years, the participants in this course inspired a lot of ideas going into this blog.