Final answer:
Caesar describes Cassius as someone who thinks too much and poses a threat due to his ambition.
Step-by-step explanation:
In Shakespeare's play Julius Caesar, the character Caesar expresses his thoughts about Cassius. In Act 1, Scene 2, Caesar says, 'Yond Cassius has a lean and hungry look. He thinks too much; such men are dangerous.' Here, Caesar is describing Cassius as someone who is overly ambitious and may pose a threat to him. This quote highlights Caesar's perception of Cassius as a cunning and conspiring individual.