Final answer:
Hamlet's line indicates his wish for his thoughts to be more violent and vengeful, highlighting a shift towards decisive action.
Step-by-step explanation:
In the line, "O from this time forth, / My thoughts be bloody, or be nothing worth!" (line 65), Hamlet is expressing a desire for his thoughts to become more violent and vengeful. This line reflects Hamlet's growing frustration and his resolve to take decisive, and possibly bloody, action as opposed to remaining in a state of indecision and inaction. The use of the word "bloody" clearly denotes a departure from peaceful contemplation towards thoughts of vengeance and aggression, foreshadowing Hamlet's subsequent actions in Shakespeare's play.