Nine in the third place means

If one is not extremely careful,

Somebody may come up from behind and strike him.

Misfortune.

At certain times extraordinary caution is absolutely necessary. But it is just in such life situations that we find upright and strong personalities who, conscious of being in the right, disdain to hold themselves on guard, because they consider it petty. Instead, they go their way proud and unconcerned. But this self-confidence deludes them. There are dangers lurking for which they are unprepared. Yet such danger is not unavoidable; one can escape it if he understands that the time demands that he pay especial attention to small and insignificant things.