Answer:
Bushido was followed by Japan's samurai warriors and their precursors in feudal Japan, as well as much of central and east Asia. The principles of bushido emphasized honor, courage, skill in the martial arts, and loyalty to a warrior's master (daimyo) above all else.
Thoreau mostly uses imagery to illustrate time in the excerpt. The second sentence is saying that he is in the midst of time/living, and he can "detect how shallow it is," meaning that he is aware that life is short and that the end is inevitable. Thoreau also describes time as being fleeting, but ever-present.
I hope this helps!
A. true. I actually attended that opera in 2012!
