Prayer needs tears, for so David said, “Hear my prayer, Hashem; do not be silent to my tears” (Tehillim 39:13). And so we find in the prayer of Chizkiyahu, “And Chizkiyahu wept a great weeping” (Melachim II 20:3), and HaKadosh Baruch Hu said to him, “I have heard your prayer, I have seen your tears” (Melachim II 20:5). And so of Chanah it is written, “And she prayed to Hashem, weeping bitterly” (Shmuel I 1:10).