"Her eyes glowed. She spoke as if confiding a secret. "Have you noticed the moonlight? - Larry Niven

In the world of words the imagination is one of the forces of nature.

Collaborations are unnatural. The writer is a jealous god. He builds his universe without interference. He resents the carping of mentally deficient critics, and the editor’s capricious demands for revisions. Let two writers try to make one universe, and their defenses get in the way.

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.