According to Dr Martyn Lloyd-Jones, it is
A spiritual union
A mystical union
A vital union
An organic union
A personal union and
An indissoluble union.
[[i:fa6b6c1671]God, the Holy Spirit[/i:fa6b6c1671] By Dr D.M.Lloyd-Jones: Hodder and Stoughton. ISBN 0-340-69394-0]
Blessings,
Steve