We all (being reasonable persons and not fanatics) are trapped by Quine's Paradox: namely, to believe a statement p is to believe that p is true, so I believe that each of my beliefs is true. Yet I also believe that some of my beliefs (I know not which) will turn out to be false if and when tested. (I believe I left my glasses in my bedroom today, but beliefs of this sort have turned out to be false often enough...)
I believe that each of my beliefs is true;
I believe that some of my beliefs are false.
Saith Quine: "I for one had hoped for better from reasonable persons."