Robert Letham's The Holy Trinity: In Scripture, History, Theology and Worship is an incredible book. I was only half through before having to take it back to the library, but I plan to check it out again and finish it.

HIGHLY recommended.

He deals with the Trinity in the OT, NT, early church, heresies that have been refuted, and how viewing the Trinity rightly affects worship, prayer, etc.

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Kim G
Non-denom church (holds to the WCF)
Zion Community Church, Greenville, SC

Teach me Your way, O LORD;
I will walk in Your truth;
Unite my heart to fear Your name.
Psalm 86:11