Kabbalah zu Schemot 2:23

"Hear my prayer, Hashem" refers to the silent prayer (the Amidah) "And give ear to my cry" is a prayer cried out loud. A man raises his voice and cries to Hashem in his trouble, as it is written, "And their cry rose up to the Elohim" (Shemot 2:23). What is the cry? It is the cry heard when one raises one's voice in prayer and lifts up one's eyes above, as it is written, "And a shouting to the mountains" (Isaiah 22:5). This prayer breaks open all gates upon which he knocks to present his prayer before Hashem. "Keep not silence at my tears," which enter before the King and cannot be stopped by any gate or turned away in vain.