The basic idea of this quote )and the lines that come before it) is that one must live life to the fullest extent possible. Thoreau is giving this as his reason for coming out into the woods. He doesn't want to be in the position where, when he's about to die, he realizes that he never really lived.
A. "people stand like statues"
Basically the subject is what it’s about, like say you were reading about art the subject of the passage is art
I don’t see a pic can you add a picture please! I will do my best to help!