With Lucia de Lammermoor being one of my fave operas, and liking Sir Walter Scott in general, had to choose this.
Look not thou on beauty’s charming;
Sit thou still when kings are arming;
Taste not when the wine-cup glistens;
Speak not when the people listens;
Stop thine ear against the singer;
From the red gold keep thy finger;
Vacant heart and hand and eye,
Easy live and quiet die.