In what ways did the early Christians Ecumenical Councils develop the Churchs understanding of Jesus?

88. In what ways did the early Christians Ecumenical Councils develop the Churchs understanding of Jesus?

references books
1.Theological Foundations, Concepts and Methods for Understanding Christian Faith. by JJ Mueller
2. Reason, Faith and Tradition. by Martin C. Albl
and two other books journal or EDU site
no web site for reference

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