extra-essential

And the Synod do solemnly agree, that none of us will traduce or use any opprobrious terms of those that differ from us in these extra-essential and not necessary points of doctrine, but treat them with the same friendship, kindness and brotherly love, as if they had not differed from us in such Sentiments.

Lauri Lebo blog and the End of the World - The Panda's Thumb 2010

It is very true that the papists do very industriously make it their business to overthrow that distinction of fundamental and extra-fundamental doctrines; of those that are essential and those that are extra-essential; such as are of absolute necessity, and such as are not necessary, or not so necessary.

The Whole Works of the Rev. John Howe, M.A. with a Memoir of the Author. Vol. VI. 1630-1705 1822

The whole christian fraternity is confined by some to those of their own party, or particular way and per suasion in respect of some little things, altogether extra-essential and circumstantial only to religion.

The Whole Works of the Rev. John Howe, M.A. with a Memoir of the Author. Vol. VI. 1630-1705 1822