For, besides that we are assured from history of many men, nay whole nations, who doubt or disbelieve some or all of them, I cannot see how the third, viz.

"That virtue joined with piety is the best worship of God," can be an innate principle, when the name or sound virtue, is so hard to be understood; liable to so much uncertainty in its signification; and the thing it stands for so much contended about and difficult to be known.
And therefore this cannot be but a very uncertain rule of human practice, and serve but very little to the conduct of our lives, and is therefore very unfit to be assigned as an innate practical principle.
18.

Of little use if they were innate.
For let us consider this proposition as to its meaning, (for it is the sense, and not sound, that is and must be the principle or common notion,) viz.

"Virtue is the best worship of God," i.e.is most acceptable to him; which, if virtue be taken, as most commonly it is, for those actions which, according to the different opinions of several countries, are accounted laudable, will be a proposition so far from being certain, that it will not be true.

If virtue be taken for actions conformable to God's will, or to the rule prescribed by God--which is the true and only measure of virtue when virtue is used to signify what is in its own nature right and good--then this proposition, "That virtue is the best worship of God," will be most true and certain, but of very little use in human life: since it will amount to no more but this, viz.
"That God is pleased with the doing of what he commands";--which a man may certainly know to be true, without knowing what it is that God doth command; and so be as far from any rule or principle of his actions as he was before.