The doctrine of the Spirit was further elaborated by [[Saint Augustine|St. Augustine]] in his important work ''De Trinitate'' ''("On the Trinity"),'' in which the Holy Spirit is seen as the bond of union and love between the Father and the Son.<ref>[http://www.religionfacts.com/christianity/beliefs/holy_spirit.htm The Holy Spirit in Christian Theology.]</ref>
The doctrine of the Spirit was further elaborated by [[Saint Augustine|St. Augustine]] in his important work ''De Trinitate'' ''("On the Trinity"),'' in which the Holy Spirit is seen as the bond of union and love between the Father and the Son.<ref>[http://www.religionfacts.com/christianity/beliefs/holy_spirit.htm The Holy Spirit in Christian Theology.]</ref>
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The essential Christian teachings about the Holy Spirit are summarized in the [[Nicene Creed]]:
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The [[Nicene Creed]] states:
{{cquote|I believe in the Holy Spirit, the Lord the giver of life, who proceeds from the Father [and the Son]. With the Father and Son he is worshiped and glorified. He has spoken through the prophets.}}
{{cquote|I believe in the Holy Spirit, the Lord the giver of life, who proceeds from the Father [and the Son]. With the Father and Son he is worshiped and glorified. He has spoken through the prophets.}}