Reb Tzadok continued Torah's of Rebbi Nachman concentrating on ratzon (desire) to carry out Hashem's will. The "trying" is our portion in this world. Importance of korbonos (daily sacrifices in the Holy Temple). A lo lishmah ratzon (intention not for the sake of Heaven) is from the side of the yetzer hara (Evil Inclination). Jews caught in the grips of chain smoking or pornography loathe themselves.