The problem with “the truth” is that it isn’t a matter of white and black, but of gray scale.
The only things that can be true are statements about about reality, and they are true if they agree with reality. The problem with this fact is that statements agree with reality more or less, because it means that statements can’t agree with reality unambiguously, since “unambiguous” is orthogonal to “more or less”.
The problem with “the truth” is thereby that it can’t reach perfection. It can only be “more or less”, but will ultimately arrive to at least two contradictory (orthogonal) statements that are just as true.
The problem with “the truth” is thus that it is relative, like whitish or greenish. Our problem is to handle this problem.
Another contribution to understanding of conceptualization http://menvall.wordpress.com/