The past is like a great stone that lies on the bed of a river, hidden from view but shaping the currents of the water as it flows by. You cannot read the currents in the river of your own life, and navigate them safely, if you do not understand what causes them. You must know your past, for it will shape your future

The past is like a great stone that lies on the bed of a river, hidden from view but shaping the currents of the water as it flows by. You cannot read the currents in the river of your own life, and navigate them safely, if you do not understand what causes them. You must know your past, for it will shape your future. (Derdriu in Viking Warrior by Judson Roberts)