"A Michtam" is a pilar of scripture placed in a public setting. David may have had theses psalms engraved in stones in his palace. We don't value attending church. It is so readily available to us. We choose when to go or when not to attend. We arrive late. We sleep through the sermons. What is life like when you can no longer gather for worship? They travel half the day and risk their lives to gather for church. It is that important to them. Everything will try to prevent you from doing what God calls you to do. The world, family, close friends, even "christians" groups/church will conflict. At first David had no friends and may have wondered why God anointed him with so much opposition. God provides small encouragements such has David's friend Prince Jonathan. If Bibles were rare, how precious would it become to you? Those with restricted access to Bibles, memorize pages. They become living Bibles in people who can recite it. David's life was his vow to God. You saved my life, so I owe you my life. David was a soldier trained in his armor and weapons (Bible and prayer) so that he had confidence to approach the enemy for his king (God).