Ner Mitzvah Vetorah Or - Tapa dura

Ner mivtzva Vetorah Or is a fundamental work of Chasidus that covers many basic concepts within Chabad Chasidus philosophy and is split into two parts:
(1) Shaar HaEmunah, an explanation of the essence of the Mitva of Belief.
(2) Shaar HaYichud, an explanation of the mitzva of G-ds Unity, also known as Kuntres HaHisbonenus, Treatise on meditation. Special attention is paid to concepts of Passover and the Splitting of the Sea of Reeds. The Lubavitcher Rebbe stated that this work is The Laws of the Festival, on the Festival, a necessary accompaniment to the Passover season. The Rebbe Maharash called it the key to Chasidus.