Second--Because such substitution would destroy an integral part of the moral law. The law written on the heart of man said nothing about keeping holy any other day than the seventh; for all admit that, had Adam not fallen, there never would have been any other holy day. If, then, this law does _not now_ require the sanctification of the seventh day, _the fourth commandment must have been annihilated_; and if another day is _now_ the Sabbath, a new commandment, requiring _for a new reason_ the sanctification of a different day, must have been substituted in its place. But this new law can be _no part of the moral law_, because it was _not written on man's heart_, nor did any human being know of its existence till thousands of God's people had been taken home to glory. God gave to Adam _free permission_ to labor and do work on every day but the seventh, and he, as a free moral agent, accepted the proffered boon. Therefore, to labor on any one of the first six days of the week is, under the covenant of works, _as innocent in itself_ as to pray to the Creator of the Universe. It is as much a natural and inalienable right, as "life, liberty, and the pursuit of happiness." Now, if there is a law that requires the keeping holy of some other day, it must have its origin in the new-covenant grace of God; and if that other day, and not the seventh, is _now_ the Sabbath, men are _now_ no more under a _natural_ obligation to keep a Sabbath than to be baptized, or to celebrate the Lord's Supper. The obligation to keep it _must_, on your principle, grow out of their new-covenant relation to God in Christ. Let us now look for a moment at the consequences flowing from the doctrine, that some other day--the first, for example--has been substituted for the seventh. "Try the spirits." "By their fruits ye shall know them." 1. If this doctrine be true, the doctrine _that Adam represented all his posterity, must be false_; for, if Adam covenanted, as you admit he did, to keep holy the seventh day of every week, and _we_ are not bound to do so, he certainly did not represent us, neither in that nor in any other part of the covenant; for, if we did not promise in Adam to keep holy the Sabbath-day, we did not promise to keep any thing else. 2. If this doctrine be true, _there is now no such thing as original sin_. This follows as a matter of course; for, if Adam did not represent us, we are not _born sinners_. The fact might be proved in another way, but this is enough.