The 15th of Kislev
The 15th of Kislev represents the completed state of the entire month’s divine service. We should therefore (for a start) add a state of perfection to our Torah study, and in particular to our study of Chassidus; as well as to our service of prayer and our performance of Mitzvos (which predominantly includes Tzedakah and acts of kindness, for they represent all of the Mitzvos).
Influence the Past and Future
The 15th of Kislev represents a state of completeness in the entire month of Kislev… We need to increase and make up for all aspects of our divine service from the previous days, particularly the 10th of Kislev. For despite having already accomplished a significant amount, each person knows just how much more he could personally add. As we have explained, a Jew is intrinsically unlimited, and it is within his power and capacity to continuously produce further and further incomparable increases. We certainly have the ability to add to or complete our past service.
As for preparations for our future service (which includes the Festival of Liberation, Yud Tes Kislev – which the Previous Rebbe called the “Festival of All Festivals”) these matters certainly need to be done in the most complete and perfect manner.
Perfect the Cosmos
By fulfilling these directives, there will be completeness in all “three pillars upon which the world stands” – through our Torah, prayer and acts of kindness. This brings completeness to mankind (each of whom is a microcosm of the world at large), as well as the literal world itself, of course. Ultimately, we influence the entire Seder Hishtalshelus [all of Creation, both spiritual and physical realms]. (Night following the 15th of Kislev 5749; Hisva’aduyos p.426-427)