In Psalm 25, today's Responsorial Psalm, the psalmist asks the Lord to teach him his paths. Teaching is the word here. The Holy Spirit is the greatest teacher there is, and spiritual growth is so much more important than gaining physical strength or intellectual knowledge. The Spirit teaches one by revealing "secrets" of God's love to the heart. All schools and teachers in the world can make you more knowledgeable about things of the world, but only the Holy Spirit can make you holier and more pleasing to God.