Some say that ever 'gainst the season comes,
Wherein our Saviour's birth is celebrated,
The bird of dawning singeth all night long;
And then, they say, no spirit dare stir abroad;
The nights are wholesome; then no planets strike,
No fairy takes, or witch hath power to charm,
So hallow'd and so gracious is that time.
Shakepeare Hamlet (Act 1 ~ scene 1)