Some believe that the entire first book of the Psalms, of which Psalm 23 is the middle, pertains to the years of David being pursued by Saul or are at least reflective of that time. Others believe that Psalm 23 is a Psalm by David once he had become king. Regardless of which one is correct, David had lengthy periods of trials and knew God’s provision for him.
There are at least two things that David did persistently that are evident from this Psalm (and his life) that factored into his earnestness in speaking Psalm 23: 1) he recognized His sovereignty and thanked God for his provision and protection; and 2) he worked hard at knowing Him better (of course the Holy Spirit was at work too). These two things are important to know because I am going to pose a series of questions that force you to compare yourself with David in later entries. When you find yourself paling in comparison to David it is typically because he did one or both of these more frequently and more rigorously than we do.