3.5.3 Evidence of the Holy Spirit's activity in the time of the Old Testament

Since the Holy Spirit has existed eternally in unity with the Father and the Son, He was active during the creation and is active in the history of salvation. So it is that Holy Scripture provides abundant evidence of the Spirit's activity in Old Testament times, despite the fact that there was no understanding of the Trinity at that time, nor any dispensation of Holy Spirit in the New Testament sense. In the time of the old covenant, the Holy Spirit brought forth many promises concerning the coming of the Messiah and the establishment of the new covenant.