Here are four insightful quotes about the Old Testament Books of I and II Samuel.

On the overarching purpose of Samuel
“The First Book of Samuel was written to show who the true Shepherd‑King of Israel must be: the Son of David, a man ‘after the Lord’s own heart’; Second Samuel was written to show that this true King of Israel will finally establish God’s forever kingdom.”
The Gospel Coalition

On what Samuel teaches about God and obedience
“In 1 and 2 Samuel what you really see is how God operates, what He requires of His people, and what He does when His people fail… Hope is never found in a human king; hope is found in the King of kings.”
Paul Tripp

On God’s sovereignty in the narrative
“The books of 1 & 2 Samuel reveal God’s sovereignty in history: God humbles the proud and exalts the humble, and He sovereignly works through the rise and fall of kings to accomplish His purposes.”
Randy McCracken

On the theological significance of Samuel’s leadership and the kingship theme
“Samuel’s story and the monarchy narratives show that God providentially draws His people back into right relationship with Himself by choosing and exalting leaders according to His will, even amid human failure.”
Jonathan Anderson