We live lives of unknowing, ever striving for what we might know. "Now we see as in a glass, darkly; now we see in part." And that's not so bad, is it? Peirce might call the belief that we don't know fully a regulative ideal; or I suppose, in Rorty’s terms, we might call it a pragmatic hope. If we take ourselves not to have arrived at perfect justice yet, that belief will drive us to keep seeking to improve our justice.“If God held all truth enclosed in his right hand, and in his left hand the one and only ever-striving drive for truth, even with the corollary of erring forever and ever, and if he were to say to me:--Choose! I would humbly fall down to him at his left hand and say: Father, give! Pure truth is indeed only for you alone!”*
*Soren Kierkegaard, Concluding Unscientific Postscript to Philosophical Fragments. (Princeton: Princeton University Press, 1992, Vol I) 106. The quotation is a citation from Lessing by Kierkegaard.