David recognized that the very same God who formed the universe, who created him hears his voice. He recognized that even if no one else in the universe cared about his situation, the one who created the universe does. 

God cares about the details of your life, He hears your voice, never stop communicating with Him, never stop seeking Him. 

3 Truths:
1. God Hears Your Voice
2. God Listens to what you have to say.
3. This should be reason enough to keep talking to God

I love the lord because he hears my voice
and my prayer for mercy.
Because he bends down to listen,
I will pray as long as I have breath!
Psalm 116:1-2