Nephi worries here. He says, "I am encompassed about, because of the temptations and the sins which do so easily beset me," and "when I desire to rejoice, my heart groaneth because of my sins." But he then goes on to state that "nertheless, I know in whom I have trusted." "My God hath been my support."
Then Nephi leads us into a series of statements of what the Lord has done for him.
Each of these are personal events in Nephi’s life. He has told us about these in 1 Nephi. So, this psalm is not simply a lyrical poem of abstract experiences. This offers a template for meaningful and successful prayer. When we remember things that God has done, we should not just say in one word, "Thanks." We should give thanks and remember in detail the specific ways God has blessed in our personal lives.