The lines
Nine at the beginning [yang at bottom] means:
Not going out of the door and the courtyard
Is without blame.
Often a man who would like to undertake something finds himself confronted by insurmountable limitations. Then he must know where to stop. If he rightly understands this and does not go beyond the limits set for him, he accumulates an energy that enables him, when the proper time comes, to act with great force. Discretion is of prime importance in preparing the way for momentous things. Concerning this, Kongfu (Confucius) says:
Where disorder develops, words are the first steps. If the prince is not discreet, he loses his servant. If the servant is not discreet he loses his life. If germinating things are not handled with discretion, the perfecting of them is impeded. Therefore the superior man is careful to maintain silence and does not go forth.
Nine in the second place means:
Not going out of the gate and the courtyard
Brings misfortune.
When the time for action has come, the moment must be quickly seized. Just as water first collects in a lake without flowing out, yet is certain to find an outlet when the lake is full, so it is in the life of man. It is a good thing to hesitate so long as the time for action has not come, but no longer. Once the obstacles to action have been removed, anxious hesitation is a mistake that is bound to bring disaster, because one misses one\'s opportunity.
Six in the third place means:
He who knows limitation
Will have cause to lament.
No blame.
If an individual is bent only on pleasures and enjoyment, it is easy for him to lose his sense of the limits that are necessary. If he gives himself over to extravagance, he will have to suffer the consequences, with accompanying regret. He must not seek to lay the blame on others. Only when we realise that our mistakes are of our own making will such disagreeable experiences free us of errors.
Six in the fourth place means:
Contented limitation. Success.
Every limitation has its value, but a limitation that requires persistent effort entails a cost of too much energy. When, however, the limitation is a natural one (as for example, the limitation by which water flows only downhill), it necessarily leads to success, for then it means a saving of energy. The energy that otherwise would be consumed in a vain struggle with the object, is applied wholly to the benefit of the matter in hand, and success is assured.