“And on top of this let me assure you that in writing, or learning to write, solid daily practice is the prescription and 'waiting upon inspiration' a lure.”
Quiller-Couch puts dependable practice ahead of waiting for inspiration, making regular work the ordinary foundation from which stronger moments can emerge.
Source details
On The Art of Reading, Lecture V, Project Gutenberg #16579; the surrounding analogy connects disciplined reading with the harder sister art of writing.