It would be interesting to discover the circumstances under which a believer might evaluate God as being silent to his prayers.  So let’s make sense of David’s line in Psalm 28, “Do not be deaf to me, lest you hush and I die”.

1) To You, O Lord, I call; My rock, do not be deaf to me, For if You are silent to me, I will become like those who go down to the pit. 2) Hear the voice of my supplications when I cry to You for help, When I lift up my hands toward Your holy sanctuary.

Psalms 28:1-2, NASB

Whatever the trouble might have been that David was experiencing, he was certain that God’s voice would keep him alive, and we must note that that is what matters. We must also note that David ascribed security to Yahweh, calling him “my Rock”. I see God’s deafness and zipped lip as both miniscule panic and poetic over-dramatization. No believer need think that God is deaf or silent. Finally, let us be aware that David wrote kee shama qôl tachᵊnunaee, because he HEARS the sound of my supplications. The son of David shows us that without his word to us we are dead.

Truly, truly, I say to you, he who hears My word, and believes Him who sent Me, has eternal life, and does not come into judgment, but has passed out of death into life.

John 5:24, NASB