פָּ֣תַח צ֭וּר וַיָּז֣וּבוּ מָ֑יִם הָ֝לְכ֗וּ בַּצִּיּ֥וֹת נָהָֽר׃
Il fendit la roche et des eaux jaillirent, s’épandant dans les régions arides comme un fleuve.
Likutei Moharan
And "heart" is the aspect of "selah" (rock), that from there the speech, in the aspect of "words in rock" ([Talmud] Megillah 18). And selah (rock) is the aspect of tzur (rock, flint), as in the aspect of "He opened a rock and the waters gushed out" (Psalms 105:41), and this is the aspect of "lev" (heart), in the aspect of "the rock of my heart".