Consider further, why the ten commandments of the Decalogue were promulgated from Mount Sinai in so miraculous a way; why they were engraved on two tables of stone, and why these were placed in the ark, over which was placed the mercy-seat with cherubs, and the place where those commandments were was called the Holy of holies, within which Aaron was permitted to enter only once a year, and his with sacrifices and incense; and if he had entered without these, he would have fallen dead; also why so many miracles were afterward performed by means of that ark.
Have not all through out the whole globe a knowledge of like commandments? Do not their civil laws prescribe the same? Who does not know from merely natural lumen, that for the sake of order in every kingdom, adultery, theft, murder, false witness, and other things in the Decalogue are forbidden? Why then must those same precepts have been promulgated by so many miracles, and regarded as so holy? Can there be any other reason than that everyone might do them from religion, and thus from God, and not merely from civil and moral law, and thus from self and for the sake of the world? Such was the reason for their promulgation from Mount Sinai and their holiness;for to do these commandments from religion purifies the internal man, opens heaven, admits the Lord, and makes man as to his spirit an angel of heaven. And this is why the nations outside the church who do these commandments from religion are all saved, but not anyone who does them merely from civil and moral law.
Inquire now whether the faith of this day, which is, that the Lord suffered for our sins, that he took away the curse of the law by fulfilling it, and that man is justified and saved by this faith apart from good works, does not cancel all these commandments. Look about and discover how many there are at this day in the Christian world who do not live according to this faith. I know that they will answer that they are weak and imperfect men, born in sins, and the like. But who is not able to think from religion? This the Lord gives to everyone; and in him who thinks these things from religion the Lord works all things so far as he thinks. And be it known that he who thinks of these things from religion believes that there is a God, a heaven, a hell, and a life after death; but he who does not think of these things from religion does not, I affirm, believe them.
from Spiritual Life and the Word of God, Part First