BuBuIlSin (夫婦一身) literally means ‘a couple is like one body’ and in a secular sense, it is an expression that conveys the depth of a relationship where husband and wife share their lives, united spiritually and physically.
However, from a spiritual perspective, it goes beyond a mere union of man and woman. It signifies a highly advanced spiritual state where God’s spirit (the Holy Spirit) descends upon an individual, making them one with God. This symbolizes true spiritual unity, achieved by being born again through the Holy Spirit, embracing God’s heart, acting in Him, and becoming one with God through perfect faith.