At www.bethinking.org, Greg Koukl wrote an article about what happens with the idea of absolute truth dies in a culture. He writes:
When truth dies, all of its subspecies, such as ethics, perish with it. If truth can't be known, then the concept of moral truth becomes incoherent. Ethics become relative, right and wrong matters of individual opinion. This may seem a moral liberty, but it ultimately rings hollow. 'The freedom of our day,' lamented a graduate in a Harvard commencement address, 'is the freedom to devote ourselves to any values we please, on the mere condition that we do not believe them to be true.'You can read the entire article, The Death of Truth, here.