Right, which works great if your daytime job is being a professor at Oxford, but maybe less so if your only opportunity is farm labor or other physically exhausting job.

Today, more people have the opportunity to dabble in art than ever before.

Personally I've found it much easier to sustain creative stuff on the side while doing a non-knowledge-based job than a knowledge-based one. Mental exhaustion is much more of a drag than physical. (Though the knowledge-based hours were longer too, which I'm sure was a factor.)

He started writing his stories long before he was a Professor. It was while he was a young man fighting in the First World War.