Knowledge about something is directly related to lack of it. One who doesn't have peace of mind knows a lot about meditation and mindfulness techniques. One who has never thought of exploring it. One who lacks height knows what contributes to good height. One who is fat knows a lot about balanced diet. These things though never produce desired results and even if they do, it takes a lot of patience. Almost, forever.
On the same ground, people who know a lot of ways to please God, bhakti, devotion etc basically lack the blessings and who have blessings enjoy the life and never need to think about from where it all is coming. What is the source!