Final answer:
Iago's secret motivations are revealed through his use of duplicitous words and phrases in his speeches, such as 'I am not what I am', indicating his deceptive nature, and 'Thus do I ever make my fool my purse', showing his manipulation for personal gain.
Step-by-step explanation:
In understanding the secret motivations behind Iago's actions in Shakespeare's play Othello, it's important to examine his speeches closely. Certain words and phrases reflect Iago's underlying motivations and his duplicitous nature. For instance, when Iago says, 'I am not what I am', he is explicitly stating his enjoyment in deceiving others about his true nature. This duplicity is a driving force behind his actions. Another phrase,'Thus do I ever make my fool my purse', reveals his manipulative and self-serving strategies. Iago's speech is filled with rhetorical strategies that signify his desire for control and revenge. His motivations are also reflected in his soliloquies, which offer the audience insight into his inner thoughts and schemes, further showcasing his true character and intentions.