Then the Buddha gave advice of extreme importance to the group of Brahmins: 'It is not proper for a wise man who maintains (lit. protects) truth to come to the conclusion: "This alone is Truth, and everything else is false'.' Asked by the young Brahmin to explain the idea of maintaining or protecting truth, the Buddha said: ' A man has a faith. If he says, "This is my faith", so far he maintains truth. But by 9 that he cannot proceed to the absolute conclusion: "This alone is Truth, and everything else is false". In other words, a man may believe what he likes, and he may say 'I believe this'. So far he respects truth. But because of his belief or faith, he should not say that what he believes is alone the Truth, and everything else is false.
(from "What the Buddha taught, a really great book!)