“This unity of faith and sentiment some think impossible. We once preached in a certain place, on Christian union, when the minister in charge said to us, he thought the people could never be brought to believe alike. We asked him why not? He replied, because men were so differently constituted, that they could  not believe alike. We then asked him, whether men had not now, precisely the same organism, physically, mentally and morally, which they had eighteen hundred years ago? He allowed they had. We further asked him whether the primitive Christians were not all one in faith and sentiment, as well as one in heart? He replied in the affirmative, but added that they were under the teaching of inspired men. Well, said we, if we teach and inculcate the same doctrine, and the people have the same mental constitution, why then, should they not all have one faith?
Besides, we said, is it not true that all men are alike bound to believe God? And what God requires one man to believe, does He not require all to believe?
Again, said we, how could God consistently require all men everywhere to repent and believe the gospel, and yet create them with such diversified mental constitutions, that they could not understand and believe the gospel alike? The trouble, said we, lies not in the gospel, nor in the minds of the people, but in the teachings of their blind guides. Let but ministers learn to speak as the oracles of God–let them all preach the same truths which were taught by the apostles, and the people will soon come to the unity of the faith in the bonds of peace. But, the texts above quoted, fully settle the point, that Christians are required to be of the same mind, and of the same faith.”
Sermon on Christian Union