If I could receive the doctrine, merely because I dared not to differ from the whole Christian world, I might aid to swell odium against rejectors, but I should not strengthen the cause at the bar of reason.

I feel therefore that my friend must not claim Catholicity as on his side.

Trinitarians and Arians are alike useless to his argument: nay, nor can he claim more than a small fraction of Unitarians; for as many of the them believe that Jesus is to be the Judge of living and dead (as the late Dr.Lant Carpenter did) must as _necessarily_ believe his immaculate perfection as if they were Trinitarians.
The New Testament does not distinctly explain on what grounds this doctrine was believed; but we may observe that in 1 Peter i.

19 and 2 Cor.v.21, it is coupled with the Atonement, and in 1 Peter ii.

21, Romans xv.