Paul is not randomly bringing to us a series of unrelated words and images. Each one is chosen carefully and, like stepping stones, help us to move towards the place Paul prays that we would find ourselves. I kneel - I pray - says Paul.
Being rooted leads to establishment, establishment to power and power to grasping, or a fuller understanding. The term ‘grasps’ is not used anywhere else in the New Testament and implies an intellectual understanding. Which might all sound very academic – like a student grasping an important concept being taught by the Professor. Of course, we all grasp different things in different ways. It might be how an engine works; a computer; a painting; plumbing; working with fabric and so on. When we get it, we know it.