49 is a perfect square number. The perfect volleyball play is considered to be a bump, set, and spike.
Psalm 18:30 states, “As for God, his way is perfect; the word of the LORD is flawless. He is a shield to all who take refuge in him”. In this verse, David affirms that God's way is perfect and that His word is true. David's statement doesn't mean that God's way is easy, but rather that it is perfect. David's experiences with Saul and other enemies were difficult, but God remained true to His word and used those trials to shape David into a faithful servant.