Politeness is the first thing people lose once they get the power.
The study of mathematics is apt to commence in disappointment... We are told that by its aid the stars are weighed and the billions of molecules in a drop of water are counted. Yet, like the ghost of Hamlet's father, this great science eludes the efforts of our mental weapons to grasp it.
It is usually unbearably painful to read a book by an author who knows way less than you do, unless the book is a novel.