Final answer:
Caesar wishes to maintain a strong and fearless image, avoiding any signs of weakness or superstition that being unwell might imply to the Roman public.
Step-by-step explanation:
Caesar does not want the people to be told that he will not go to the Capitol because he is unwell as it might display a sense of weakness or superstition, and could potentially undermine his image of fortitudinous leadership. In ancient Rome, leaders were expected to show courage and strength.
Caesar's insistence on being perceived as fearless, even in the face of bad omens and his wife's foreboding dreams, highlights his desire to maintain a reputation of invulnerability.
Caesar does not want the people to be told that he will not go to the Capitol because he is sick because he fears that the senators will mock him if they know the true reason.
Decius Brutus suggests interpreting Calpurnia's dream in a more favorable light, which Caesar agrees to, as it presents him in a stronger and more powerful position. Caesar wants to maintain his image of being fearless and unafraid of any danger.