Act I, Scene iii
"Polonius: To thine own self be true,
And it must follow as the night the day Thou canst not then be false to any man."
"King: For what we know must be, and is as common
As any the most vulgar thing to sense -
Why should we in our peevish opposition
Take it to heart? Fie, 'tis a fault to heaven,
A fault against the dead, a fault to nature,
To reason most absurd; whose common theme
Is death of fathers, and who still hath cried
From the first corse till he that died today,
'This must be so.'"