How is a subject different from a theme?

The word subject is used in the sense of 'niche' or 'branch of knowledge'. On the other hand, the word 'theme' is used in the sense of 'the central point' of a subject or a topic. This is the main difference between the two words, namely subject and theme.

a subject is only about a part if a story but the theme is like...the moral of the story. Like slow and steady wind the race

what excerpt? i would generally think a.

may i see the passage?