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McCant (1991) explains that New Testament doctrines were presupposed within, but not fully systemized. I reason there are clearly biblical doctrines, but systemization and developed theology occurred over the ages.
MCCANT, JERRY W. (1991) ‘The Development of Doctrine in the New Testament’, in David Alan Black and David S. Dockery (eds.), New Testament Criticism and Interpretation, Grand Rapids, Zondervan Publishing House.
2010 Theodicy and Practical Theology: PhD thesis, the University of Wales, Trinity Saint David, Lampeter