In William Shakespeare's play "Julius Caesar," the character Julius Caesar expresses his unease about Cassius, noting his "lean and hungry look." This observation reflects Caesar's instinctive wariness of Cassius, suggesting that he is not someone who can be easily trusted. The implication is that Cassius is deeply contemplative and ambitious, traits that may pose a threat to Caesar's power. Caesar's instincts are informed by his belief that those who think too deeply may harbor dangerous intentions.

This quote captures the theme of perception versus reality in the play, illustrating how appearances can often mask true intentions. Caesar's comment warns of the potential danger posed by ambitious individuals like Cassius, who might plot against him due to their own aspirations. Ultimately, this insight foreshadows the political machinations that unfold, as Cassius's true ambitions lead to a conspiracy against Caesar, highlighting how awareness of others' characters can be critical in the treacherous realm of power.