Holy Ghost also functions as a witness or testator of man for God

Dr. David E. Bokovoy gives a brief description of said role: “While it is natural for Latter-day Saints to recognize that the Holy Ghost serves as an official witness of truth for man, in the administration of God, the Holy Ghost also functions as a witness or testator of man for God. Fulfilling this role as witness, the Holy Ghost serves as the scriptural “Holy Spirit of promise,” ratifying or sealing the testimonies and righteous acts of believers… In this capacity as witness of man for God, the Holy Ghost serves as the testator of all righteous acts…”