The answer to this, as with the other questions, is found in the Sicha itself. Everyone understands that the ability to know what effect certain words will have is not something for people on our level This is something which is only for a Rebbe. The Rebbe is the one to inform his Chassidim that this is what should be said and what it accomplishes.
When we look in the Sicha where the Rebbe says to announce Yechi, the Rebbe says that now (in 5748) that there is a certain completion of 68 years of the leadership of the Frierdiker Rebbe, the Avoda of announcing Yechi comes. So, it’s clear that this is something which could not be done before.
This applies to all of the Mivtzoim as well. In the year 5718, the Rebbe introduced the idea of U’faratzta. The Rebbe did not introduce that before. In 5727 the Rebbe introduced Mivtza tefillin, and in the following years new Mivtzoim were introduced. The Rebbe introduced Tzivos Hashem which has such a tremendous impact on children. Why didn’t the Rebbe introduce these before? The announcement of Ad Mosai was introduced in 5741. Why wasn’t that introduced before? And with so many hundreds of things that the Rebbe introduced at a certain time, the question could be asked, “Why didn’t he do it before?”
When the Rebbe came out with Neshek, that was the time for it. When the Rebbe came out with Mivtza tefillin, that was the time for it. And the Rebbe himself said many times how everything has its appropriate time to be revealed. Therefore, one cannot ask the question that if Yechi is so powerful, why wasn’t it done before? This is especially so when the Rebbe himself explains that we should say it now because it is 68 years since the beginning of the Frierdiker Rebbe’s leadership.
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