" Even the straightest-looking road can sometimes lead you astray, and most that are worth following are far from straight. Even at the journey’s end it is easy to look back upon all the winding turns, hills and dips, and see an inevitable line from the start point to the present. We become blind to all of the junctions, forks and opportunities to leave the road altogether. Thus we remove ourselves from the blame of becoming lost because we set out with good intentions. On Caliban we had a saying about good intentions: You cannot steer the arrow once it leaves the bow. "

― Gav Thorpe , Luther: First of the Fallen (The Horus Heresy: Characters)