The persuasiveness of natural law

Eastern University's RJ Snell makes a conclusive statement on the persuasiveness of natural law:

"One can neither deny nor question the natural law’s persuasiveness except by asking questions, conducting inquiries, achieving understandings, reaching judgments, and making choices—all of which, if understood as the operations of our own subjectivity, are the natural law at work. And if one denies that one inquires, or understands, or judges, or chooses, one either contradicts what one is doing or one really does not inquire, understand, judge, or choose, in which case persuasion is not available to that sort of creature.

With respect to postmodern suspicion, this articulation of the natural law grounds itself in no big claims about Reason or Nature or Metaphysics. Although every account intertwines itself with big theories, natural law is not grounded in them, for it claims no foundations from which it is derived, pointing only to the easily observable (even by postmodernists) data of their own questions and judgments and the fact that the more someone suspects and argues against my account the more they refute themselves."