How does the quote below relate to the theme of revenge in Hamlet? Unhand me, gentlemen.By heaven, I'll make a ghost of him that lets me!Hamlet, 1. 4

In this scene, the ghost appears to Hamlet and beckons him
to follow it.  Hamlet wants to go but he is counseled against it.  Marcellus and Horatio
attempt to stop Hamlet from following the ghost.  Just before the quoted line, we see
them trying to physically hold him back.  Hamlet is threatening to kill them for
stopping him.  We see that Hamlet is so determined to follow the ghost, he would take
revenge, even on his own friends, for preventing him.  Revenge simply means to get back
at someone for a perceived injustice.  Hamlet believes his friends are wrong to hold him
back.  He will get back at them, or have his revenge, if they prevent him from doing
what he wants to do.