Implicit or Explicit? The Doctrine of the Trinity in the Old Testament

Martin Downes @ http://against-heresies.blogspot.com considers:

• Is the Trinity revealed in the Old Testament?

• Could the Trinity have been revealed in the Old Testament?
  

1. There is only one God

2. There are three distinct persons in the Godhead: Father, Son and Spirit

3. Each person is fully God


i. The angel of the Lord in the Old Testament is clearly God, and yet is sent by God

ii. The promised Messiah in the Old Testament in clearly both human and divine

iii. Although fewer in number the Old Testament does not lack passages where two or more divine persons are referred to.