ectypal.net

...any confessional document that talks about the incarnation must also talk about the Trinity. This is why a study of the development of doctrinal statements in church history is important: it gives a first-rate insight into how doctrines interconnect and how formulations that solve one set of questions then create the ground for a new set. Chalcedon was only possible in the light of Nicaea; but once Nicaea was in place, Chalcedon, or some equivalent, became necessary as a means of connecting the dots from God in himself to God manifest in the flesh.