This psalm initially seemed out of place with the other psalms of degrees, but the more I meditated upon it, the more it seemed to fit. The psalmist is focused on David, a past king of Israel. He is thinking on his words, his desires, his accomplishments, and the Lord's blessings and promises upon his life. If you will allow me liberty to make practical application then we might say what David was as Israel's king is a foreshadowing of what the saint's King of kings, the Lord Jesus Christ is to every believer.
If that be so, then we can learn from this psalm that the saint's victorious life is dependent upon the him focusing not upon himself, circumstances, or others, but, upon the Lord Jesus Christ. Consider the following two verses.
Hebrews 12:1-2 Wherefore seeing we also are compassed about with so great a cloud of witnesses, let us lay aside every weight, and the sin which doth so easily beset us, and let us run with patience the race that is set before us, Looking unto Jesus the author and finisher of our faith; who for the joy that was set before him endured the cross, despising the shame, and is set down at the right hand of the throne of God.
Many times the believer lives defeated because he is focused on the wrong things. He may be looking out at the circumstances of life, or down at the path he must travel, or to his enemies on his left or right, when the Word of God instructs us to be looking up to our Lord and Saviour Jesus Christ. Let us focus on Him and all other things will begin to grow strangely dim.