Adam Clarke on Deuteronomy 4:6

Keep - and do them; for this is your wisdom - There was no mode of worship at this time on the face or the earth that was not wicked, obscene, puerile, foolish, or ridiculous, except that established by God himself among the Israelites. And every part of this, taken in its connection and reference, may be truly called a wise and reasonable service.

The nations - and say, Surely this great nation is a wise and understanding people - Almost all the nations in the earth showed that they had formed this opinion of the Jews, by borrowing from them the principal part of their civil code. Take away what Asia and Europe, whether ancient or modern, have borrowed from the Mosaic laws, and you leave little behind that can be called excellent.