This psalm ends with a request to save the life of David. In his righteous and steadfast love, Yahweh was to bring him out of trouble by cutting off his adversaries. In fact, he wanted Yahweh to destroy all his adversaries because he was the true servant of Yahweh.
David wanted to be saved from his enemies. He fled to Yahweh as his refuge. He wanted Yahweh to teach him his will. Yahweh was his God. He wanted Yahweh’s spirit to keep him on a level path so that he would not fall down.
David wanted a quick answer to his prayer. His spirit was failing. He did not want Yahweh to hide his face because then he would go down into the Pit. He wanted to hear the steadfast love of Yahweh in the morning. David put all his trust in Yahweh so that Yahweh might teach him the way to go. He had lifted up his soul to Yahweh.
David remembered the good old days when Yahweh had done so much. He meditated on the works of Yahweh. He stretched out his hands to Yahweh. His soul was thirsting for Yahweh like a parched land seeking water. This section ends with the musical interlude meditative pause of Selah.
The situation of David is described as being pursued by his enemies. He seems like he has been crushed to the ground. He sat in darkness as if he were dead. His spirit was fainting as mentioned above. His heart was appalled. He was in bad shape.
Psalm 143 is another lamentation psalm of David as indicated in its title. David once again asked Yahweh to hear his prayer. He wanted an answer because Yahweh was faithful and righteous. He did not want Yahweh to judge him, the humble servant. In a theme that will be repeated by Paul in the New Testament writings, he concluded that no living person was righteous before Yahweh.