If you want to learn about the Trinity I suggest the following:
1. Prayerfully read through the Gospel of John many times
2. Listen to good sermons or lectures on the Trinity
"This is My Beloved Son!" Exulting in the Trinitarian Relationships of Jesus Christ
The Trinity of Persons
2005 Desiring God Conference for Pastors
January 31, 2005
Bruce Ware
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Download: Audio
2005 Desiring God Conference for Pastors
January 31, 2005
Bruce Ware
Listen Download
Download: Audio
Contending for Our All
The Life and Ministry of Athanasius
February 1, 2005
John Piper
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The Life and Ministry of Athanasius
February 1, 2005
John Piper
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Jesus and the Father
2005 Desiring God Conference for Pastors
February 1, 2005
Bruce Ware
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Download: Audio
2005 Desiring God Conference for Pastors
February 1, 2005
Bruce Ware
Listen Download
Download: Audio
Jesus and the Spirit
2005 Desiring God Conference for Pastors
February 1, 2005
Bruce Ware
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http://www.desiringgod.org/ResourceLibrary/ConferenceMessages/ByConference/9/
2005 Desiring God Conference for Pastors
February 1, 2005
Bruce Ware
Listen Download
http://www.desiringgod.org/ResourceLibrary/ConferenceMessages/ByConference/9/
3. Read good articles on the Trinity
Contemporary Articles and Essays (60 links)
Classic Essays & Articles (42 links)
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4. Read good books on the Trinity
I have read the following books and highly recommend all of them
The Kostenberger/Swain book would be great to use while reading through the Gospel of John