In the first section of Beyond Good and Evil (BGE) it is clear that Nietzsche's view on truth is that there is no such thing as "T"ruth. This is because God - according to Nietzsche - is dead, and God was the soul guarantor of Truth. Without God, we now have to accept that there are only competing, irreconcilable perspectives on the world. This is otherwise known as Nietzsche's Perspectivism. Nietzsche is opposed to all kinds of absolutist thought (the idea of a universal truth) and only God, when he was alive, could guarantee such absolution. This is one of the reasons why Nietzsche considers the death of God the biggest thing to happen in the history of the universe as it also marks the end of Truth. After such a catastrophe, everything is now a matter of perspective, and everything is a question of evaluation. There is no such thing as a value-free perspective and we must move beyond the old "dogmatic" metaphysical systems. This theory later leads on to Nietzsche's concept of the Ubermensch.
In the first aphorism of On The Prejudices OF Philosophers, Nietzsche accuses past philosophers of being prejudiced in valuing truth over untruth. Though in the book Nietzsche does it in such a way that it almost appears that he is teasing them. He continually asks them questions such as "Given that we want truth: why do we not prefer untruth? Or uncertainty?" Even though Nietzsche speaks in such a leading way, he is merely pointing out that philosophers have made the mistake of making a value judgement - it is not a given truth that truth is inherently more valuable than untruth. For many people truth is clearly not more preferable to the status of untruth. Imagine if we spent our whole lives on the truth that one-day we will die, life would become intolerable. Rather, we would prefer to spend our lives thinking of an eternal afterlife, which to Nietzsche is a definite untruth due to his disbelief in metaphysics.