Nothing we do is better than the work of handmind. When mind uses itself without the hands it runs the circle and may go too fast; even speech using the voice only may go too fast. The hand that shapes the mind into clay or written word slows thought to the gait of things and lets it be subject to accident and time. Purity is on the edge of evil, they say.
Always Coming Home - Todd Barton, Margaret Chodos-Irvine, Ursula K. Le Guin

"Always Coming Home" – Ursula K. Le Guin (p. 175)