On his dying bed, David gives instructions to Solomon and anoints him as King of Israel. By doing this he puts down the rebellion of Adonijah and preserves the royal line through which the Messiah will come.
Getting weary is part of life under the sun. Believers face trials and tribulations just like unbelievers, but Jesus Christ has overcome the world. David is a model for believers to keep pushing on trusting God even when life continues to be difficult.
Getting old is part of life, but when we serve God we can grow old with purpose to the glory of God. This message shows how when a person dedicates themselves to the cause of God, generosity and loyalty come with it.