You're right, Laurel; too much self-discipline will discourage your playful, wandering imagination. It'll snuff out the flames of inspiration and creativity. And it'll weigh you down with routines and logic. It simply isn't "spiritual."
But, then, neither is too little.
Tallyho,
The Universe
Just think what you know to think, say what you know to say, and do what you know to do, Laurel. Every day, lots and lots.