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The Holy Spirit (or Holy Ghost) is the third person of the [[Trinity]], co-equal with [[God the Father]] and [[Jesus Christ]]. He is the one who convicts of sin and guides into the truth.

The doctrine of the Holy Spirit being God as part of the [[Trinity]] is one of the great mysteries of Christianity, and it is also a core teachings of orthodox [[Christianity]], setting Christianity apart from other [[monotheism|monotheistic]] religions such as [[Islam]], as well various off-shoots of Christianity such as [[Jehovah's Witnesses]] and [[Christadelphianism]].