Well, even things that God reveals directly are not, in apophatic theology, strictly correct, as in complete and accurate. They are always limited and a compromise with human intellectual limitations and human language. This is a really useful thing to know because it prevents us from making some kinds of errors, and can also become important in how we read Scripture. Ultimatly it is what protects us from descending into a kind of literalism and fundamentalism.
Take something like the Trinity, which in the normal course of things we would say is true, revealed information from God. And yet we can see that on some level it does not make normal sense, it does not quite hang together. It is trying to push us towards a sort of intuitive sense or way of touching God with the mind, but even that in the end is less than what God is. Our direct experience of him will be limited too, by what we are.