Six in the fifth place occupies the ruler's position with yin yielding; in the time of Enthusiasm, it is drowned in pleasure and unable to stand on its own. The focus of authority and the rallying point of the multitude both lie in the fourth line.
The yang firmness of the fourth has won the masses, which an indulgent, weak ruler cannot restrain; it is a case of a weak, incapable sovereign being controlled by a minister who monopolizes power.
Residing in the ruler's position is correctness; being controlled by those below brings illness and suffering. The sixth line occupies the honored position; though authority is lost, the throne has not perished.
Hence it says: 'Persistent illness, yet constantly does not die,' meaning that while correct it suffers illness, chronically sick yet never dying, like the rulers of the late Han and Wei dynasties.
The ways a ruler brings about peril and ruin are manifold, but enthusiasm is among the most frequent. In the fourth line, it does not speak of losing correctness, whereas in the fifth line, strong intimidation is revealed.
The fourth originally has no fault; hence in the fourth line, the meaning of a great minister undertaking the affairs of all under Heaven is expressed, while in the fifth line, the meaning of a weak ruler in the honored position unable to stand on his own, with majesty and authority slipping away, is stated.
Each derives its meaning based on its respective line, and thus they differ. If the fifth does not lose the ruler's way and the fourth manages enthusiasm, it is a case of appointing the right person and resting peacefully in the achievement, like Tai Jia and King Cheng.
In Youthful Folly, the honored position is also held by a yin line, with the second line being yang as the master of Folly; yet there it is auspicious while here it is an illness, because the times are different.
In childlike folly, relying on others is fitting; in addictive enthusiasm, losing power to others is the path to peril and ruin. Thus in Youthful Folly there is mutual resonance, which is an entrustment; in Enthusiasm there is mutual intimidation, which is a loss of power.
Furthermore, the hearts above and below turn exclusively to the fourth line.