In the first verse of Psalm 23, we see two kinds of declaration. One is a declaration of faith, the other a declaration of surrender.
“The Lord is my shepherd,” is a declaration of faith on a God who is able to provide, protect and empower. It is faith because God is invisible and yet we can believe he exists .
Blessed are those who have not seen and yet have believed. -John 20:29
The declaration of surrender is implied. If we declare that God is our shepherd, we are tacitly declaring that we are his sheep. Sheep are meek, vulnerable and easily frightened. This means we are to take the attitude of a sheep, that we are lost without a shepherd. In other words, we can find fulfillment and contentment in God and his will for us. I shall not want.
Yet, a surrender to God’s will also means recognizing that he knows what we want and need and that he will supply these according to HIS riches in glory. Not ours.
And my God shall supply all your need according to His riches in glory by Christ Jesus. -Philippians 4:19
Our concept of what we want is totally different than God’s. God’s concept is always better and always abundant.
It is significant to note that David made these declarations even when he had already been chosen as king. Everything about David’s life, whether he was shepherd or king, was centered on following after God’s heart.
And when He had removed him, He raised up for them David as king, to whom also He gave testimony and said, ‘I have found David the[son of Jesse, a man after My own heart, who will do all My will.’ -Acts 13:22
Declarations of faith and surrender are declarations of devotion to God.