Shift of the Axis
A life of faith is like that. Prayer is our connection to God, and by continually connecting with God, we are able to make adjustments to the places where our axis has shifted. Without the continual checking, we would drift radically off the path God has set for us. Our life would be off its "axis." We might not notice the drift, but it would happen, slowly and imperceptibly.
So, God have given us the grace of prayer to reconnect - to re-orient ourselves. Repentance - a turning around - brings us back to a "right" position on our axis.