The reason I believe our rights are found not just from Natural Law, but in the Scriptures themselves, is precisely what his book is about. The Purtians helped form our nation, and were most responsible for promoting education. Thus, the "Puritan work ethic" that was spread by education (do everything unto the Glory of God) through the scriptures. England started this education of the citizenry by translating the Bible into English in order for citizens to read the Bible and understand the Gospel themselves, to learn about God's creation, and as Founding Father John Jay wrote:
By knowing their rights, they will sooner perceive when they are violated and be the better prepared to defend and assert them.