Jeremiah Gridley, leader of the Massachusetts bar when John Adams joined it, said that “a Lawyer ought never to be without a Book of Moral Philosophy on his Table.” In the founding era, moral philosophy was itself part of common law reasoning, as was political philosophy.
This sets the Founders apart not only from the modern academy, with its separate departments for government, philosophy, and law, but even from their British contemporaries of the late 18th century such as the jurist William Blackstone. As James Wilson noted of Blackstone, “He should be read and studied. He deserves to be much admired; but he ought not to be implicitly followed.”
Contra Blackstone, the Founders maintained that if one does not think about common law precedents in particular, and legal reasoning in general, in light of the moral/legal reasoning behind them, one will misread them. The reasoning that justified them was inseparable from the law itself, and informed the scope and limitations of any precedent that followed.