I couldn't run a tight schedule, and if you're any good at teaching, you get sucked dry because you like your students and you're trying to help them, but you don't have any time left to write yourself.
“Very few people possess true artistic ability. It is therefore both unseemly and unproductive to irritate the situation by making an effort. If you have a burning, restless urge to write or paint, simply eat something sweet and the feeling will pass.”