"If a thing's worth doing, it's worth doing badly."
Words to live by for any would-be artist.
And,
"...a little knowledge is a dangerous thing, but it is not one half so bad as a lot of ignorance."
To remember when confronted by one's own or another's dogma.
Or the lack of agency inherent in a situation beyond your control.
"Sometimes you just have to go the way things take you."
Wisdom for wonderlings:
"The important thing about magic is how you don't use it."
"Coruscate" does seem to describe Pratchet's light touch with fiction.