I found this quote as I was preparing my seminary lesson today.
Elder Dallin H. Oaks:
"Many Christians reject the idea of a tangible, personal God and a Godhead of three separate beings. They believe that God is a spirit and that the Godhead is only one God. In our view these concepts are evidence of the falling away we call the Great Apostasy.
"We maintain that the concepts identified by such nonscriptural terms as 'the incomprehensible mystery of God' and 'the mystery of the Holy Trinity' are attributable to the ideas of Greek philosophy. These philosophical concepts transformed Christianity in the first few centuries following the deaths of the Apostles. . . .
"The consequences persist in the various creeds of Christianity, which declare a Godhead of only one being and which describe that single being or God as 'incomprehensible' and 'without body, parts, or passions.'" (in Conference Report, Apr. 1995, 112–13; or Ensign, May 1995, 8485).
“In common with the rest of Christianity, we believe in a Godhead of Father, Son, and Holy Ghost. However, we testify that these three members of the Godhead are three separate and distinct beings. We also testify that God the Father is not just a spirit but is a glorified person with a tangible body, as is his resurrected Son, Jesus Christ” (in Conference Report, Apr. 1995, 112; or Ensign, May 1995, 84).