Likutei Moharan 21:7/ליקוטי מוהר"ן כ״א:ז׳

17. Now, there are times when the “mentalities” and the Godly influx are concealed, in the aspect of pregnancy. Then, the most beneficial thing for a person is crying out—be it in prayer or Torah study.

2For concealment/pregnancy corresponds to (Deuteronomy 32:18), “The Mighty One Who bore you, you exhausted,” as in (Isaiah 37:3), “There is no strength to give birth”—like a woman who is too exhausted to give birth. When she crouches to deliver she screams seventy screams, equal to the number of words in Psalm [20], “May God answer,” and then gives birth (Zohar III, 249b). These seventy screams correspond to the seven calls which David uttered over the water (Psalm 29), with each one comprised of ten <as is known>.

3<These cries> which a person cries out during his prayer and Torah study, when his mentalities are <concealed> in the aspect of pregnancy, parallel the cries of the woman in labor. And the Holy One, who knows just how the mentalities are concealed, He hears our cries. These cries are in place of the cries of the Divine Presence—as though She were crying out—and then She gives birth to the mentalities. This corresponds to [the teaching] (Orach Chaim 61:4): The voice arouses concentration—i.e. the mentalities.

4And this corresponds to, “… would she not be embarrassed for seven days?” Seven days is the aspect of the seven calls of David. They are the seventy calls which one must cry out in order to take the light of the face from concealment to revelation; and revelation is synonymous with birth.

5And then, after the birth, “the blood is decomposed and turned into milk” (Bekhorot 6b). This is the aspect of “embarrassed,” because embarrassment is when “the redness [of the cheeks] disappears and is replaced with whiteness” (Bava Metzia 58b). In other words, “the blood is decomposed and is turned into milk.”

6And this is: “TZur Yeladekha Teshy” (The Mighty One Who bore you, you exhausted); the first letters of which stand for “TZaakateinu Yode’ah Taalumot” ([Hear] our cries, Knower of mysteries). And this is TeShY: an acronym for “Tikaleim Shiv’at Yamim” (she will be embarrassed for seven days).