Quoted By:
"The art of war is of vital importance to
the State. It is a matter of life and death, a road either to safety or to ruin. Hence it is a subject of inquiry which can on no account be neglected."
This sounds similar to what Zangetsu says to ichigo about battle in general, as in life. Replacing war with struggle or fight(for what you desire in life) makes life's objectives quite obvious.
