Second life

Two knights and one horse, two minds in one dome, I have been good, I have been evil, I've done and not at all, I'm the moon, I'm the sun, I'm a father and a son, I'm an angel, I'm a demon, I have fallen, I have risen, I have sinned all for a reason, I have won, I have lost, I've been found, I've been lost, I've been saved, I've been cursed, been in love, been in lust, I have pulled, I have shoved, I've been pushed, I've been crushed, I have stood upon that ledge waiting to take one more step, I have seen the milky way here I am, A-R-M.