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What those signs should be God did not determine, leaving this for the people, most probably to the leaders or heads of families, who were guided in their choice by an interior inspiration of the Holy Ghost. Thomas, who says that, as under the law of nature (when there was no written law), men were guided by interior inspiration in worshiping God, so also they determined what signs should be used in the external acts of worship (III:60:5, ad 3).Afterwards, however, as it was necessary to give a written law: (a) because the law of nature had been obscured by sin, and (b) because it was time to give a more explicit knowledge of the grace of Christ, then also it became necessary to determine what external signs should be used as sacraments (III:60:5, ad 3; III:61:3, ad 2) This was not necessary immediately after the Fall, by reason of the fullness of faith and knowledge imparted to Adam.Commentators on the Scriptures and theologians almost unanimously assert that there were sacraments under the law of nature and under the Mosaic Law, as there are sacraments of greater dignity under the Law of Christ.
The vast majority of theologians teach that this ceremony was a sacrament and that it was instituted as a remedy for original sin; consequently that it conferred grace, not indeed of itself (), but by reason of the faith in Christ which it expressed.The principal reason for a sacramental system is found in man. Thomas (III:61:1), to be led by things corporeal and sense-perceptible to things spiritual and intelligible; now Divine Providence provides for everything in accordance with its nature (); therefore it is fitting that Divine Wisdom should provide means of salvation for men in the form of certain corporeal and sensible signs which are called sacraments. For this reason the majority of theologians hold that no sacraments would have been instituted even if that state had lasted for a long time. Apart from what was or might have been in that extraordinary state, the use of sacred symbols is universal. Augustine says that every religion, true or false, has its visible signs or sacraments."In nullum nomen religionis, seu verum seu falsum, coadunari homines possunt, nisi aliquo signaculorum seu sacramentorum visibilium consortio colligantur" ( XIX.11).Martin Luther's Catechism, the Augsburg, and later the Westminster, Confessions are strongly sacramental in their tone, putting to shame the degenerate followers of those who compiled them" (ibid., p.7, 8) The reasons underlying a sacramental system are as follows: Taking the word "sacrament" in its broadest sense, as the sign of something sacred and hidden (the Greek word is "mystery"), we can say that the whole world is a vast sacramental system, in that material things are unto men the signs of things spiritual and sacred, even of the Divinity.