In what will be a key passage for my thesis, Kierkegaard writes on the nature of doubt:
Reflection is disinterested. Consciousness, however, is the relation and thereby is interest, a duality that is perfectly and with pregnant double meaning expressed in the word ‘interest’ (interesse [being in between]). Therefore, all disinterested knowledge (mathematics, esthetics, metaphysics) is only the presupposition of doubt. As soon as the interest is canceled, doubt is not conquered but is neutralized, and all such knowledge is simply a retrogression. Thus it would be a misunderstanding for someone to think that doubt can be overcome by so-called objective thinking. Doubt is a higher form than any objective thinking, for it presupposes the latter but has something more, a third, which is interest or consciousness.
This is from Johannes Climacus, or De Omnibus Dubitandum Est (which means Everything Is to Be Doubted). This unfinished work of Kierkegaard’s is written in narrative form, and would have been a precursor to his later works written under the Johannes Climacus pseudonym. Both of those other works of Kierkegaard’s will function as the backbone of the primary sources I use in my thesis (along with that book on his epistemology by M.G. Piety).
As far as I have found, there is no clearer passage that Kierkegaard wrote which touches on, not only what it means to doubt, but also the actual function of objective and subjective knowledge (he builds his understanding of subjectivity later, in Concluding Unscientific Postscript). This is sort of his first step in that direction, and he makes the case here that we need a subtle shift in how we understand “objective knowledge.”
Doubt, he says, cannot be “conquered” by objective knowledge — rather, doubt is “neutralized.” Why does he parse this out? Because is necessarily an interested stance toward the subject that is being doubted. Objectivity, on the other hand, is disinterested in its subject. In other words, knowing a subject objectively necessarily removes the knower sufficiently far away from the subject so that the knower can reflect on the subject abstractly. Objective thinking, in fact, requires this to be the case, because being interested (existentially speaking, “interest” is better understood as being emotionally or spiritually or otherwise vested in the outcome of something) in the subject leads to bias, and humans, by definition, know a something objectively while also being biased in the outcome of whether a claim is true or not.
That’s why only mathematics and tautologies fall within the realm of true objective knowledge — the knower can effectively and easily remove oneself from the equation, so to speak. Ethico-religious knowledge, on the other hand, cannot be known objectively because those kinds of truths are existentially meaningful. We are interested in those truths, vested in those outcomes.
All of that to say: I’ll need to argue for a subtle shift in the meaning of both objectivity and subjectivity if I am to make my case effectively.