Today you are shown to be wrong. On any given day, you are shown to be wrong. By induction, you are wrong every day. If you never get to "not wrong today!" then you're not getting more rational. There's improvements (wrong every day but the questions are harder each day or something) but the line as it stands sounds superficially deep but in practice is not rationality-focused.
Not necessarily. Finding out you're incorrect about some fact of the world is a first step to uncovering a truth, indeed in the case of a dichotomy, being incorrect about a fact instructs you on the correct truth. So if you were shown to be wrong about fact A, you are almost always closer to a true belief, even if it simply the absence of a false one.
Also, being shown to be wrong every day does not mean shown to be wrong about the same thing. Each day you could be shown to be wrong about a different thing, and each error can lead to updates in your mental ...
Scott H. Young is giving himself 12 months to complete MIT's computer science curriculum on his own, via MIT's OpenCourseWare.