"Seek the company of those who are looking for the truth, but fleefrom those who have found it." -Vaclav Havel
I don't read Havel as saying that Truth doesn't exist. I read him as saying that a commitment to truth-seeking is more important than any particular Truth we may currently think we have found.
For people who want to test their own commitment to truth-seeking, I recommend reading the best blog on the planet: http://overcomingbias.com/. Or go directly to http://en.wikipedia.org/wiki/List_of_cognitive_biases and see which ones you have.