לקוטי שיחות חלק ד׳ - ואתחנן

The “great voice” of Matan Torah naturally penetrated all of creation. This was because Matan Torah contained a revelation of the Future Era, when “all flesh together will see.” Therefore, by its very nature, the voice produced no echo.

There are several interpretations of the verse (Devarim 5:19), “A great voice that did not cease”:

1. The voice divided into the seventy languages.
2. All the prophets received their prophecy from that voice.
3. The voice produced no echo.

Regarding the third interpretation, we must understand: What is so remarkable about the fact that it produced no echo? Seemingly, according to the laws of nature, there should have been an echo. Why, then, did Hashem perform a miracle so that it would not produce an echo? After all, “Hashem does not perform a miracle without purpose.”

The explanation is as follows: An echo is reflected sound. When a sound cannot penetrate an object, it rebounds and produces an echo. The “great voice” of Matan Torah, however, naturally penetrated all of creation. This was because Matan Torah contained a revelation of the Future Era, when “all flesh together will see.” Therefore, by its very nature, it produced no echo.

The lesson is that a person must study Torah in a manner that allows Torah to penetrate his entire being—even the inanimate aspect within him, represented by the heel. This is accomplished not through the intellectual dimension of Torah, but through Torah’s “great voice”—the G‑dliness within Torah.