This psalm begins with expressions of devotion, which may be applied to Christ; but ends with such confidence of a resurrection, as must be applied to Christ, and to him only. Matthew Henry
When the Holy Spirit filled Peter and the other disciples that day in Jerusalem while Jews from all over the known world celebrated the Feast of Pentecost, He shined a whole new light on this Messianic Psalm, the glimpse of Jesus that God gave us through David in Psalm 16.
When Scripture interprets Scripture, we can be certain the interpretation is true. God gave David the foresight to write about the true path of life and to know that apart from Almighty God there is no good thing. He was the only portion David needed.
I have set the LORD always before me. Because he is at my right hand, I will not be shaken. Therefore my heart is glad and my tongue rejoices; my body also will rest secure, because you will not abandon me to the grave, nor will you let your Holy One see decay. You have made known to me the path of life . . . (Ps. 16:8-11)
By the power of the Holy Spirit, Peter was able to explain the prophecy David delivered some 1000 years earlier.
Brothers, I can tell you confidently that the patriarch David died and was buried, and his tomb is here to this day. (Acts 2:29)
You see, through the Spirit of God, David had written about Jesus way back then, the only One who would conquer the grave.
But he was a prophet and knew that God had promised on oath he would place one of his descendants on his throne. Seeing what was ahead, he spoke of the resurrection of the Christ, that he was not abandoned to the grave, nor did his body see decay. (Acts 2:29-31)
David’s passionate pursuit, his complete devotion was to Almighty God. Even then, as he ran from crazy King Saul, David knew that everything he needed for real life could only be found in God Himself. He knew God’s way was the only path of life.
That path of life is Jesus Christ the Messiah who would come to earth 1000 years later to go through hell and conquer death so you and I could know the path of life, too.
Jesus was David’s only refuge, and He is our only true refuge.