It's absurd to claim we know nothing, at this point in our civilization. We know a whole lot, even if imperfectly. We know why the stars shine and how planets move. We know to a great extent how matter works, how computers are possible and perhaps minds as well. There is still much to be discovered about minds, consciousness and the nature of thoughts. But it is not true we know nothing. And we can know more and more, and that's incredibly powerful, useful, and constructive if we use this knowledge wisely. With great power comes great responsibility.