A greater quantity of practice leads to a heightened quality within the artist's work. Therefore, at certain points within the artist's life, the artist (of any medium) must relinquish arrogance and abandon the pursuit of appealing to an audience and simply practice. Ultimately, the results of practice are not important whatsoever. The act of practicing is all that matters.

The ability to compel and excite an audience may be measures of quality, but how do we truly measure the quality of art as a collective when art is a subjective individualized experience? No, "quality" is not the issue.
We are talking about the essence of what it is to be human, because that is what quality works of art are at the core, simply a resonance within the human psyche. They engage the audience and hold them down until the curtain drops, or they make the audience scream and cry and run for their lives.
We do not practice for a heighten sense of quality within our work. We practice so that we may dig deeper into the core of the human spirit. We practice so that we may free ourselves from the confines of crippling cultural structures.