[あらゆ(新湯);さらゆ;しんゆ(新湯), arayu ( shin yu ); sarayu ; shinyu ( shin yu )] (n) clean, freshly poured bath; hot water just poured into a bath that no one has entered yet
[かれをしりおのれをしればひゃくせんあやうからず, karewoshirionorewoshirebahyakusen'ayaukarazu] (exp) If you know your enemy and know yourself, in a hundred battles you will never be defeated.