Notice how the Shaytan said that he will ambush us on “the straight path.” Just as a thief only robs a house with expensive goods, the Shaytan comes strongest after those who are on the spiritual path and have fostered a sense of faith. Another commentary on the verse suggests that when the Shaytan says he will come from “behind” us it means he will delude us regarding our divine origin, suggesting we are nothing but an accidental creation of a Godless universe.