Once at a Yom-Tov meal at which the Rebbe Rayatz presided, mayim acharonim was brought to the table in a silver container. The Rebbe demurred, and recounted the following exchange. The Mitteler Rebbe once asked his father, the Alter Rebbe: "What will be the function of mayim acharonim in future time, after the fulfillment of the prophetic promise, 'I shall remove the spirit of impurity from the earth'?" Replied the Alter Rebbe: "At that time, its function will relate to those who engaged in worldly matters in purity." "When that time comes," concluded the Rebbe Rayatz, "it will be appropriate to bring mayim acharonim to the table in a silver container."
The Rebbe "Tzemach Tzedek" wrote more profusely than all the Rebbeim. He did not publish his books himself. In the Alter Rebbe's Likutei Torah, the Tzemach Tzedek added numerous comments and annotations, but he never released his own discourses and responsa to be printed. Chassidim used to copy his writings by hand, and these comprise the majority of the manuscripts of Chassidic discourses extant today. The first editions of the Tzemach Tzedek published after his passing (on 13 Nissan, 5626 - March 29 1866).
The Rebbe Maharash innovated the concept of "L'Chatchila Ariber". The approach of L'chatchila Ariber teaches that if we come upon an obstacle to a task we are involved in, or an obstacle to a mitzva or project or good deed which comes our way (or we pursue), we should overcome the obstacle in the most direct manner. The Rebbe Maharash explained that while some people propose that when confronted with an obstacle the best route is to go around, or under it -- and the Rebbe Maharash says: "And I say one has to go l'chatchila ariber [from the start, go over it]."
On the occasion of the fiftieth jubilee of the foundation of the Tomchei Temimim Yeshivah in Lubavitch, the Rebbe Rashab delivered the Maamar Heichaltzu. This keynote discourse, with its insistence on the essential brotherhood of all Jews, was presented as a foundation stone for the Yeshivah which was destined to educate and inspire generations of Lubavitcher chassidim toward the sublime ideal of Ahavas Yisrael.