text: does anyone know who the third person of the trinity is?   caspar?    the holy ghost.  the typical sequence referred to is "father, son, and the holy ghost" -- the everlasting spirit.  the word comes from the greek new testament word pneuma (greek: πνεύμα), more recently translated holy spirit.  these are three manifestationsof god.   e.g., in the new testament book of john 14:26, jesus is quoted as saying: "but the comforter, which is the holy ghost, whom the father will send in my name, he shall teach you all things, and bring all things to your remembrance, whatsoever i have said unto you."  [king james translation]  see more here:  http://en.wikipedia.org/wiki/holy_spirit