The desire for greater freedom in worship continued to increase, until in 1643 the General Assembly appointed a committee with instructions to prepare, and have in readiness for the next Assembly, a Directory for Divine Worship in the Church of Scotland. This was a distinct concession to that section of the Church which was opposed to even the simplest forms of an optional liturgy. The work, however, was superseded by a similar undertaking on a larger scale, in virtue of an invitation from the members of the Assembly of Divines at Westminster to the Church of Scotland to join with them in the preparation, among other standards, of a Directory of Worship for the use of the Churches of both England and Scotland. The invitation was accepted with readiness, and "certain ministers of good word, and representative elders highly approved of by their brethren," were elected to represent the Scottish Church in this great work. These men were Baillie, Henderson, Rutherford, Gillespie and Douglas, ministers, with Johnston, of Warriston, and Lords Cassilis and Maitland as lay representatives; Argyle, Balmerinoch and Loudon were afterwards added. The work was duly prosecuted at Westminster, and, although the Scotch Commissioners with reluctance relinquished their Book of Common Order, yet for the sake of the uniformity in worship which they hoped to see established throughout England, Scotland and Ireland, they joined heartily in the work, and carried it when completed to the Assembly of the Church of Scotland, by which it was duly examined, slightly amended in the directions concerning baptism and marriage, and finally, unanimously approved in all its parts, and adopted. The terms in which the Assembly expressed its approval of this work are unreserved: "The General Assembly, having most seriously considered, revised and examined the Directory aforementioned, after several public readings of it, after much deliberation, both publicly and in private committees, after full liberty given to all to object against it, and earnest invitations of all who have any scruples about it, to make known the same, that they might be satisfied, doth unanimously, and without a contrary voice, agree to and approve the following Directory in all the heads thereof, together with the preface set before it; and doth require, decern and ordain that, according to the plain tenor and meaning thereof and the intent of the preface, it be carefully and uniformly observed and practised by all the ministers and others within this Kingdom whom it doth concern."