I’ll be with you straight. Go a little before.
[Exeunt all but Hamlet.]
How all occasions do inform against me
And spur my dull revenge! What is a man,
If his chief good and market of his time
Be but to sleep and feed? A beast, no more.
Sure he that made us with such large discourse,
Looking before and after, gave us not
That capability and godlike reason
To fust in us unus’d. Now, whether it be
Bestial oblivion, or some craven scruple
Of thinking too precisely on th’ event,-
A thought which, quarter’d, hath but one part wisdom
And ever three parts coward,- I do not know
Why yet I live to say ‘This thing’s to do,’
Sith I have cause, and will, and strength, and means
To do’t. Examples gross as earth exhort me.
Witness this army of such mass and charge,
Led by a delicate and tender prince,
Whose spirit, with divine ambition puff’d,
Makes mouths at the invisible event,
Exposing what is mortal and unsure
To all that fortune, death, and danger dare,
Even for an eggshell. Rightly to be great
Is not to stir without great argument,
But greatly to find quarrel in a straw
When honour’s at the stake. How stand I then,
That have a father kill’d, a mother stain’d,
Excitements of my reason and my blood,
And let all sleep, while to my shame I see
The imminent death of twenty thousand men
That for a fantasy and trick of fame
Go to their graves like beds, fight for a plot
Whereon the numbers cannot try the cause,
Which is not tomb enough and continent
To hide the slain? O, from this time forth,
My thoughts be bloody, or be nothing worth! (Lines 33-69)

On the way to the ship to England, we meet the young Fortinbras who is stopping his army to give courtesy notice that he is passing through Denmark.

Hamlet meets a captain, and asks what’s afoot;  The captain relates that they are going to take a piece of Polish land that is basically worthless. Hamlet points out that surely if it’s worthless the Polish won’t defend it, but the captain says there is a fort there.

Hamlet muses that if this Prince Fortinbras can compellingly convince men to arms for this trifle, that he can find his own motivation.