Final answer:
The line "Who steals my purse steals trash" is from Shakespeare's 'Othello', not a poem. It is one of the well-known lines spoken by the character Iago.
Step-by-step explanation:
The line "Who steals my purse steals trash" is from the play 'Othello' by William Shakespeare, not from a Unit 1 poem. This line is spoken by the character Iago in Act III, Scene III, demonstrating his deceitful and manipulative nature. Shakespeare's works are often studied in English literature courses and the analysis of such lines can provide insight into the themes and characters of his plays.