I came across another great G.K. Chesterton quote lately:
You say grace before meals.
But I say grace before the play and the opera,
And grace before the concert and the pantomime,
And grace before I open a book,
And grace before sketching, painting,
Swimming, fencing, boxing, walking, playing, dancing;
And grace before I dip the pen in the ink.
Cited in Frederick Buechner's Speak What We Feel (Not What We Ought To Say), which in turn was cited by Ron Reed in his blog Oblations.