Psalm 16:8-11 (NKJV)
8 I have set the Lord always before me; Because He is at my right hand I shall not be moved. 9 Therefore my heart is glad, and my glory rejoices; My flesh also will rest in hope. 10 For You will not leave my soul in Sheol, Nor will You allow Your Holy One to see corruption. 11 You will show me the path of life; In Your presence is fullness of joy; At Your right hand are pleasures forevermore.

All of these verses were shared by the St. Peter in his first sermon (Acts 2:25-28) after the Holy Spirit came upon everyone on the day of Pentecost. In these words Peter says David was speaking of Christ. For those who place their faith in Christ find rest in Christ. They find eternal life and a life on earth that can be lived in joy even when facing the painful moments of life.

The words of St. Peter: �Men and brethren, let me speak freely to you of the patriarch David, that he is both dead and buried, and his tomb is with us to this day. Therefore, being a prophet, and knowing that God had sworn with an oath to him that of the fruit of his body, according to the flesh, He would raise up the Christ to sit on his throne, he, foreseeing this, spoke concerning the resurrection of the Christ, that His soul was not left in Hades, nor did His flesh see corruption. This Jesus God has raised up, of which we are all witnesses. Therefore being exalted to the right hand of God, and having received from the Father the promise of the Holy Spirit, He poured out this which you now see and hear. �For David did not ascend into the heavens, but he says himself:

�The Lord said to my Lord,
�Sit at My right hand,
Till I make Your enemies Your footstool.��

�Therefore let all the house of Israel know assuredly that God has made this Jesus, whom you crucified, both Lord and Christ.� Now when they heard this, they were cut to the heart, and said to Peter and the rest of the apostles, �Men and brethren, what shall we do?� Then Peter said to them, �Repent, and let every one of you be baptized in the name of Jesus Christ for the remission of sins; and you shall receive the gift of the Holy Spirit. For the promise is to you and to your children, and to all who are afar off, as many as the Lord our God will call.�

Peter�s message was on the salvation from sin given as a gift to all those willing to repent of their sin and to follow Christ by placing their faith and trust in Him. For their faith they would receive a free gift of salvation, the opportunity to live eternally with Christ in heaven. Salvation is a free gift offered to all people who are willing to receive it.