Many (most?) people will accept the following two principles:
- The truth matters.
- No one (except God) has a corner on the truth.
Therefore, debate is necessary.
Because of principle #2, humility is necessary, and continual engagement with others is necessary. We should not think, “I have obtained the truth, so there is no need for debate.”
Some people put so much emphasis on principle #2 that they are unwilling or uninterested in debating the truth. But this has the effect of negating principle #1. If we stop short of finding the truth, or declare that the truth is unobtainable, then we are essentially saying that the truth is not necessary. To believe that the truth matters, is also to believe that the truth is something that can be grasped (not exhaustively, or in every situation, but in general; see principle #2), and is worth fighting for.