Did this gentleman choose to jump up and down at the beach, or is it the Will of God?
Deuteronomy 30 - The Lord thy God will circumcise your heart ..." Thanks, Yahweh. Having all that extra skin on there is a sure way for it to get dirty.
Fortunately, Deuteronomy is quick, dirty, and mercifully short. It's basically the same format as the last few chapters. "If you do what Yahweh says, He'll be happy and bless you. If not ... well, we ought to know by now what that entails." Murder, death, cursing, blah blah.
Long after this book was written, a gentleman named Paul living in the Roman Empire misquoted a part of this chapter to serve his own ends. Deuteronomy 30:14 says, "... the word is very nigh unto thee, in thy mouth, and in thy heart, that thou may do it."
Basically, Deuteronomy 30:14 says that though Yahweh's Law is professed and in our heart, we have the ability to choose to do it.
In the Book of Roman 10:8, Paul wrote: "The word is nigh thee, even in thy mouth, and in thy heart: that is, the word of faith, which we preach." Paul leaves out "that thou may do it" and replaces it with "that is, the word of faith, which we preach."
By doing so, this passage is turned on its head. Now, instead of faith and choosing to do the right thing; Paul is now supporting salvation by faith alone.