“The mind is like a muddy road. Two ruts run down its center, from all the carts that have passed that way. No matter how many carts try to roll alongside the ruts, to stay out of the mud, sooner or later, a turn here or a jolt there will send them down into the ruts for good. Just so is the mind. As hard as we try to keep our thoughts out of the old ways, the old patterns, the old ruts, any little jog or jerk will send them right back down into the mud.”
–from Adam Gidwitz’s The Inquisitor’s Tale