Hamlet:
Swear by my sword
Never to speak of this that you have heard.

Ghost:
[Beneath] Swear by his sword.

Hamlet:
Well said, old mole, canst work i' th' earth so fast?
A worthy pioner! Once more remove, good friends.

Horatio:
O day and night, but this is wondrous strange!

Hamlet:
And therefore as a stranger give it welcome.
There are more things in heaven and earth, Horatio,
Than are dreamt of in your philosophy.

Hamlet Act 1, scene 5, 159–167