Matthew Henry Commentary Judges 13:24-25

"And the woman bare a son, and called his name Samson: and the child grew, and Jehovah blessed him. And the Spirit of Jehovah began to move him in Mahaneh-dan, between Zorah and Eshtaol." — Judges 13:24-25 (ASV)

The Spirit of the Lord began to move Samson in his youth. This was evidence that the Lord blessed him. When God gives his blessing, he gives his Spirit to qualify them for the blessing. Those are blessed indeed in whom the Spirit of grace begins to work during their childhood. Samson drank no wine or strong drink, yet excelled in strength and courage, for he had the Spirit of God moving him; therefore be not drunk with wine, but be filled with the Spirit.