A major NT theme for believers is the concept of perseverance. This is something David articulated well. If we look closely at this Psalm, we can see that David seems troubled. He is calling out to the Lord and pleading with Him to listen. He simply asks for grace and that the Lord would hear His prayer.
Yet, as we continue through the Psalm, we read David encouraging the reader to persevere relationally toward God. He believes that the Lord hears Him even though there is no indication that He has acted on David’s behalf. David urges himself (and us) to continue to plow forward.
Tremble, and do not sin; Meditate in your heart upon your bed, and be still. Selah. 5 Offer the sacrifices of righteousness, And trust in the LORD.
Psalms 4:4-5 NASB
David understood that even if things got really bad, He knew God was still in control. He believed it with all his heart. He had incredible trust and resilient faith. The circumstances David faced when he wrote this were most likely awful. But he would not let that deter his faith or his worship of his Father. He continued to seek and call out to the Lord, just as we must do as well.