What is the doctrine or theory, attributed to Melanchthon, that in the regeneration of a human soul there is a coöperation, or joint agency, on the part both of God and of man called?

synergism — The doctrine or theory, attributed to Melanchthon, that in the regeneration of a human soul there is a coöperation, or joint agency, on the part both of God and of man. (Webster's 1913.)

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