Leo Tolstoy. (№ 419577)

I am a very bad person, very stupid towards good, and therefore I need great efforts in order not to be completely a scoundrel. As Yuri Samarin once said very well that he is an excellent teacher of mathematics, because he is very dull in mathematics. I am exactly the same in mathematics, but I am, most importantly, the same in the matter of good - very stupid, and therefore not entirely bad - no, I will boldly say: a good teacher.