Ever have those times when you don't know how to pray? How to pray according to the will of God? Actually, we never really know how to pray:
"Likewise the Spirit also helpeth our infirmities: for we know not what we should pray for as we ought: but the Spirit itself maketh intercession for us with groanings which cannot be uttered. And he that searcheth the hearts knoweth what is the mind of the Spirit, because he maketh intercession for the saints according to the will of God" (Romans 8:26-27).