Theses Sabbaticæ, or, The doctrine of the Sabbath wherein the Sabbaths I. Morality, II. Change, III. Beginning. IV. Sanctification, are clearly discussed, which were first handled more largely in sundry sermons in Cambridge in New-England in opening of the Fourth COmmandment : in unfolding whereof many scriptures are cleared, divers cases of conscience resolved, and the morall law as a rule of life to a believer, occasionally and distinctly handled / by Thomas Shepard ...

Thesis 184.

The Sabbath being no visible signe of invisible grace, it [ 184] cannot therefore be any Sacramentall sign or typicall, tis therefore an indicant and declarative signe of our communion with God, and God with us, of our interest in him, and of his in us: and therefore in those places, Exod. 13.31. and Ezek. 20.20. where tis called a sign, it is not made a signe simply and nakedly considered in it selfe (as all Sacramentall and typicall signes be) but it is so called in respect of our kee∣ping of it, or as it is observed and kept; and therefore it runs in way of promise, Ezek. 20.20. If ye hallow my Sabbaths they shall then be a signe between me and you, and you shall know (hereby) that I am the Lord your God; and although the Sabbath it selfe be called a signe, Exod 31. yet it is explai∣ned

vers. 13. to be such a signe as to know hereby that the Lord our God sanctifies us; and in Ezek. 20.20. that we may know hereby that he is the Lord our God: for we know he is the Lord our God if he sanctifies us; and that we are his people, if we sanctifie, or be sanctified of him; and in this respect it becomes not onely a signe, but a mutuall signe be∣tween God and us, and in no other respect (as Wallaeus would stretch it) and hence it is that whoever makes a con∣science of sanctifying the Sabbath aright, shall not long want assurance of Gods love, by this blessed signe.