The Book of Deuteronomy consists of a lengthy speech Moses delivers before he dies. Across the Jordan in the land of Moab did Moses begin to expound this Torah. Sefat Emet points out that Moses had been teaching for forty years. This was not the first time he was teaching Torah but quite the opposite – he was at the end of a lifetime of teaching. He explains that Moses had the mindset of a beginner – someone for whom teaching Torah never got old or stale. The Hebrew word to expound bei’eir has the same letters as the word for spring be’er, for just as a spring constantly provides fresh water so too does the Torah constantly provide new insights to those who expound it.