The trouble with Eichmann was precisely that so many were like him, and that the many were neither perverted nor sadistic, that they were, and still … - Hannah Arendt

Kant was also quite aware that "the urgent need" of reason is both different from and "more than mere quest and desire for knowledge." Hence, the distinguishing of the two faculties, reason and intellect, coincides with a distinction between two altogether different mental activities, thinking and knowing.

[N]o matter how abstract our theories may sound or how consistent our arguments may appear, there are incidents and stories behind them which, at least for ourselves, contain as in a nutshell the full meaning of whatever we have to say.

It was mathematics, the non-empirical science par excellence, wherein the mind appears to play only with itself, that turned out to be the science of sciences, delivering the key to those laws of nature and the universe that are concealed by appearances.