Properly used, danger can have an important meaning as a protective measure. Thus heaven has its perilous height protecting it against every attempt at invasion, and earth has its mountains and bodies of water, separating countries by their dangers. Thus also rulers make use of danger to protect themselves against attacks from without and against turmoil within.
The image
Water flows on uninterruptedly and reaches its foal:
The image of the Abysmal repeated.
Thus the superior man walks in lasting virtue
And carries on the business of teaching.
Water reaches its goal by flowing continually. It fills up every depression before it flows on. The superior man follows its example; he is concerned that goodness should be an established attribute of character rather than an accidental and isolated occurrence. So likewise in teaching others everything depends on consistency, for it is only through repetition that the pupil makes the material his own.



The lines
Six at the beginning [yin at bottom] means:
Repetition of the Abysmal.
In the abyss one falls into a pit.
Misfortune.
By growing used to what is dangerous, a man can easily allow it to become part of him. He is familiar with it and grows used to evil. With this he has lost the right way, and misfortune is the natural result.
Nine in the second place means:
The abyss is dangerous.
One should strive to attain small things only.
When we\'re in danger we ought not to attempt to get out of it immediately, regardless of circumstances; at first we must content ourselves with not being overcome by it. We must calmly weigh the conditions of the time and by satisfied with small gains, because for the time being a great success cannot be attained. A spring flows only sparingly at first, and tarries for some time before it makes its way in to the open.
Six in the third place means:
Forward and backward, abyss on abyss.
In danger like this, pause at first and wait,
Otherwise you will fall into a pit in the abyss.