The earliest churches of New England were not organized with a creed, but with a covenant. Occasionally there was a confession of faith or a creedal statement; but it was regarded as quite unnecessary because it was implied in the general acceptance of the Calvinistic doctrines, and the use of the Cambridge platform or other similar document. The covenant of a church could not be a statement of beliefs, because it was a vow between Christ and his church, and a pledge of the individual members of the church with relation to each other. The creed was implied, but it was not expressed; and, although all the churches were Calvinist at first, the nature of the covenant was such that, when men grew liberal, there was no written creedal test by which they could be held to the old beliefs. When Calvinism was outgrown, it could be slowly and silently discarded, both by individual members of a church and by the church itself, because it was not explicitly contained in the covenant. The creed was rejected, but the covenant was retained. As soon as authority was withdrawn from the Puritan leaders by the English crown, the spirit of liberty began to show itself in many directions. In a sermon preached in 1691, Samuel Willard, the minister of the Old South Church in Boston, and afterwards president of Harvard College, gave utterance to what was stirring in many minds at that time. He said that God "hath nowhere by any general indulgence given away this liberty of his to any other authority in the world to have dominion over the consciences of men or to give rules of worship, but hath, on the other hand, strongly prohibited it and severely threatened any that shall presume to do it." He earnestly asserted that no authority is to be accepted but that of the Bible, and that is to be free for each person's individual interpretation. "Hath there not," Willard questions, "been too much of a pinning our faith on the credit or practice of others, attended on with a woful neglect to know what is the mind of Christ?" Here was a spirit that not many years later was showing itself in the liberal movement that grew into Unitarianism. The effort to free the consciences of men, and to bring all appeals to the Bible and to Christ, was what gave significance to the liberal movement of the next century. [Sidenote: Growth of Liberty in Church Methods.]