"He understood when the kzin kitten looked up at its parent and asked, "Is it good to eat?" The adult's eyes met Louis's eyes. Louis let his smile wi… - Larry Niven

4) It is a sin to waste the reader's time.

The priest splayed his digits wide. “Herdmaster, I learn. Later I will speak.” “You do not seem pleased.” There was no answer. “A place of puzzles,” Pastempeh-keph said. “They surrender and have not surrendered. Their tapes show rogues acting in collusion. They live neither in herds nor alone. What are they?” “What do they believe themselves to be?” Fistarteh-thuktun asked. “Perhaps that is more important.

I knew it long ago: I’m a compulsive teacher, but I can’t teach. The godawful state of today’s education system isn’t what’s stopping me. I lack at least two of the essential qualifications.
I cannot “suffer fools gladly.” The smartest of my pupils would get all my attention, and the rest would have to fend for themselves. And I can’t handle being interrupted.
Writing is the answer. Whatever I have to teach, my students will select themselves by buying the book. And nobody interrupts a printed page.