Analysis of Rav Yisrael Salanter's halachic opinion that one is required not only to hold - and shake - the Lulav but to also lift it in order to fulfill the Mitzvah. (The first 30 minutes present R. Yisrael's view. The last 20 minutes are a tangent from R. Shlomo Hakohen explaining a relevant line from the Sukkot davening.)