Matthew Henry Commentary 1 Samuel 3:19-21

"And Samuel grew, and Jehovah was with him, and did let none of his words fall to the ground. And all Israel from Dan even to Beer-sheba knew that Samuel was established to be a prophet of Jehovah. And Jehovah appeared again in Shiloh; for Jehovah revealed himself to Samuel in Shiloh by the word of Jehovah." — 1 Samuel 3:19-21 (ASV)

All increase in wisdom and grace is due to the presence of God with us. God will graciously repeat His visits to those who receive them correctly.

Early piety will be the greatest honour for young people. God will honour those who honour Him.

Let young people consider the piety of Samuel, and from him they will learn to remember their Creator in the days of their youth. Young children are capable of religion. Samuel is a proof that their waiting upon the Lord will be pleasing to Him. He is a pattern of all those amiable dispositions, which are the brightest ornament of youth and a sure source of happiness.