Final answer:
The quote is from William Shakespeare's 'Julius Caesar,' spoken by Cassius who expresses his determination to maintain control over his own destiny.
Step-by-step explanation:
The quote "I know where I will wear this dagger then; Cassius from bondage will deliver Cassius" comes from William Shakespeare's play, Julius Caesar. The character Cassius says this line in Act IV, Scene 3, expressing his readiness to take his own life rather than be captured and led in Roman triumphs. This dramatic moment highlights Cassius's views on freedom, honor, and control over one's own fate.