Hamlet
Act 1, Sc. 5, lines 85-89: Why might it be hard for Hamlet to obey his father's wish that he not punish his mother?
Ghost: But, howsomever thou pursues this act,
Taint not thy mind, nor let thy soul contrive
Against thy mother aught. Leave her to heaven
And to those thorns that in her bosom lodge
To prick and sting her. Fare thee well at once.