Why Did Jesus Send Us the Holy Spirit?: John 16:7

When I was pastoring a church in Canada, one of the members came to me, asking about the ministry of the Holy Spirit. He said that he had heard a lot of teaching about the Trinity, explanations about God the Father and God the Son (Jesus Christ), but very little about the Holy Spirit. When the subject of the Holy Spirit came up, the teaching was vague and very limited. As a result, he didn't understand what the Holy Spirit did. He knew that the Holy Spirit was part of the Trinity and was mo...