Truth is unknowable, because we can only know with our minds. I mean, no, of course truth is knowable. I'm sure, to an ant, truth is apparent: follow formic acid trails, dig in soil. To us, probably the same, our own equivalent of formic acid and digging. Comparably broader, of course, but, equivalent in terms of limitation relative to capacity. 

An Eastern monarch once charged his wise men to invent him a sentence, to be ever in view, and which should be always true in all times, and in all situations, in sadness, and in happiness, in adversity, and in prosperity. They presented him the words:

"If you lived here, you'd be home now."