Discipline is not a mystery.
Its elements are so simple they can seem mocking. Put down the extra slice of bread. Run one more mile. Pick up the pen, or brush, or violin.
It's no more complicated in the creative spheres. But it's every bit as elusive there as it is in the world at large. "I want to make work," people often confess to me when they discover I'm a working writer. "I just never seem to get to it."
The practical solution to their problem barely amounts to a paragraph. Choose a time to make work and hold that time inviolate, I tell them. If you lack inspiration, wait. Don't do anything else. The work will come.