秘ひ奥おう

noun

secrets; mysteries; hidden depths

Refers to profound, hidden truths or esoteric knowledge, often in spiritual, artistic, or technical contexts. Somewhat literary.

• 彼かれは武ぶ道どうの秘ひ奥おうを極きわめるために修しゅ行ぎょうを続つづけた。

  He continued his training to master the hidden depths of martial arts.

• この書しょ物もつには人じん生せいの秘ひ奥おうが記しるされている。

  This book records the mysteries of life.