This is the prayer of every believing sinner. It is always fresh. It is always appropriate (2 Cor. 1:9-10). It always describes my full need. It always applies to me. Most importantly, it is always welcome and heard by our Lord and Savior on the throne of grace (Joel 2:32; 1 Cor. 1:2; Rom. 10:9-13).
The LORD is our great Jehovah, our covenant-keeping, triune God: God the Father, God the Son and God the Holy Spirit. Christ is the King. He is our Mediator. He is our Captain, our Advocate and Savior (Heb. 2:10; 1 Jn. 2:1; 1 Tim. 2:5; Matt. 1:21; Jude 1:24-25). He is the King of glory, the Son of God in our nature! What a Savior!
Our triune God saves sinners by His work and at His pleasure (Eph. 1:1-11; Matt. 11:25-27). We must never presume. We always feel needy. We have every confidence in Him, because we look, not to ourselves, but to Him whose work alone saves sinners by His sufferings, His death, and His interceding life (Rom. 5:6-10; Heb. 7:25; 1 Cor. 15:3-4,13-22).
This verse is the end of the Psalm. Whether the beginning or end of the day, whether the beginning of faith, during our walk of faith or at the end of our lives, this prayer is on our lips and in our heart: "Save, LORD: let the King hear us when we call!"