Christian Brethren,—A letter of public invitation has been addressed to the Unitarians of this town and neighbourhood, by the Rev. Fielding Ould, on behalf of himself and twelve other gentlemen associated with him, urging us, with the earnestness of Christian anxiety, to bend our minds to their expositions of our errors and our dangers. We naturally interpreted this to be an invitation to discuss the most momentous questions as equal with equal. We thought, indeed, that we saw an assumption of superiority, if not of infallibility, perhaps inseparable from minds so trained: still we supposed, that this superiority was to be maintained by argument and fair discussion: and this was all that we desired. It never occurred to us, that the reverend gentleman might possibly expect us to accept him as a divinely appointed judge of truth, whose teachings were to be received in submission and silence; or that he could suppose that convictions like ours, convictions that have resisted all the persuasions of worldly ease and interest, that have removed from us the charities and sympathies of men like him, and held in simple fidelity to truth and God, could be so lightly shaken that nothing more was required to blow them away than a course of _ex parte_ lectures without answer or discussion. If the object had been to confirm Trinitarians in their views, this kind of proceeding we should have understood; but surely something more was required when Unitarians were publicly invited to the controversy. Much less could we anticipate that the reverend gentleman, holding himself to be upon a “religious level” far above us, to belong to a different order of spirits, could yet be so far removed from the Christian and Apostolical spirit as to refuse to bring his “light” into direct conflict with our “darkness.” With these expectations of controversy, and having no bonds with anything but truth, we unfeignedly rejoiced, that, for the first time in this community, both sides of the great question were about to appear together before the solemn tribunal of public attention.