[matmann2001]

The best evidence is in the process.

When a literature class reads a novel, the professor doesn't just teach students to accept the words as they are. The students are encouraged to interpret and to understand how the author's thoughts originated, and then to extrapolate how that might be applicable in a modern context. Even the worst literature classes I've taken were taught like this.

When a math class is introduced to a new theorem, a professor will often breeze through the derivation of it (if you're lucky). This just trains students to find the right order of manipulations that solves the equation, rather than to understand what the equation and its transformations really represent. Sure, some classes at some schools might be better than this, but there are plenty more who aren't.