Nine in the fourth place means:
If a man goes on quietly and perseveringly working at the removal of resistances, success comes in the end. The obstructions give way and all occasion for remorse arising from excessive use of power disappears.
Such a man's power does not show externally, yet it can move heavy loads, like a big cart whose real strength lies in its axle. The less that power is applied outwardly, the greater its effect.