Final answer:
Julius Caesar in William Shakespeare's play, Julius Caesar, is the character who said the quote about Cassius. Caesar expresses his suspicion of Cassius and preference for men who seem less threatening.
Step-by-step explanation:
The quote "Let me have men about me that are fat, Sleek-headed men, and such as sleep o'nights; Yond Cassius has a lean and hungry look; he thinks too much; such men are dangerous." is spoken by the character Julius Caesar in William Shakespeare's play, Julius Caesar. This statement reflects Caesar's suspicion and mistrust toward Cassius, as well as his general preference for non-threatening, contented men over those who appear unsatisfied and overly contemplative.
The context of this quote is significant in understanding the political intrigue and character dynamics that are central to the plot of Shakespeare's play. Caesar's observation about Cassius foreshadows the conspiracy against him and highlights Caesar's awareness of potential threats to his power.