In 1863 Alexander Campbell wrote:
Our kinsman Redeemer is now the absolute Monarch of the whole creation of God. All the angels, principalities and powers of the universe are at his command. What an honor to humanity!
Unitarianism is but another name for deism or theism. It is not Christianity. It is not the gospel of the grace of God.
Divinity, absolute Divinity, in all its grandeur, dwelt in him, and shall forever dwell in him. "All things were created by him and for him." And he was before any creature--the eternal Alpha and Omega, the Beginning and the End, the First and the Last.
Why should any man of good understanding make an effort to undeify the second Adam--the Lord from heaven, and the Lord of heaven! Did he not say, "I and my Father are one" (John x. 30)? His contemporaries called this blasphemy, and took up stones to stone him. This was the second effort made to murder him. With the Jews, this was blasphemy of the first degree. He was not, however, disposed to take it back, or explain it away. He condescended to reason with them. He argued the case: "If I do not the work of my Father, believe me not. But if I do the works of my Father, believe not me, but believe the works: that you may know and believe that the Father is in me and I in him. Hence many there believed on him" (John x. 41).
I should cheerfully maintain his claims in New England, or in Old England, against any man of character or reputation who assumes Unitarianism, Arianism, or Socinianism, with either tongue or pen. I write not this boastingly, but with an ardent and philanthropic desire, believing, as I do, that there is not another name given under these heavens by or through which any human being can be saved. My motto is, "He that believes the gospel shall be saved, and he that believeth not shall be condemned," and consequently exiled forever from the presence of the Lord and from the glory of his power.