The ancients say that sincerity is part of human nature. And that sincerity is the way of heaven. According to the Doctrine of the Mean (Zhong Yong), there are different levels of sincerity and the most complete of it allows the Yi diviner to divine like a spirit (shen).
The Judgment in Hexagram 61 Zhong Fu / Inner Truth says:
Inner Truth. Pigs and fishes. Good fortune. It furthers one to cross the great water. Perseverance furthers.
Pigs and fishes are the least intelligent of all animals and therefore the most difficult to influence. The force of inner truth must grow great indeed before its influence can extend to such creatures. In dealing with people as intractable and difficult to influence as a pig or a fish, the whole secret of success depends on finding the right way of approach. One must first rid oneself of all prejudice and, so to speak, let the psyche of the other person act on one without restraint. Then one will establish contact with him, understand and gain power over him. When a door has thus opened, the force of one’s personality will influence him. If in this way one finds no obstacles insurmountable, one can undertake even the most dangerous things, such as crossing the great water, and succeed.
[Wilhelm / Baynes]
If you have ever visited pig or fish farms, you may find that pigs and fishes are happiest when it comes to feeding time. Just like humans, creatures need to eat, to fill their empty stomachs. To the pigs and fishes, their owners by feeding and taking good care of them are sincere. This can also apply to reliable teachers and students.
Nine in the second place means:
A crane calling in the shade. Its young answers it. I have a good goblet. I will share it with you.
Confucius says about this line:
The superior man abides in his room. If his words are well spoken, he meets with assent at a distance of more than a thousand miles. How much more then from nearby! If the superior man abides in his room and his words are not well spoken, he meets with contradiction at a distance of more than a thousand miles. How much more then from nearby!
Words go forth from one’s own person and exert their influence on men. Deeds are born close at hand and become visible far away.
Words and deeds are the hinge and bow spring of the superior man. As hinge and bow spring move, they bring honor or disgrace.
Through words and deeds the superior man moves heaven and earth. Must one not, then, be cautious?
The great sage advised that in our dealings with people and/or nations by way of speech, writing and/or action, the Junzi have to be sincere, reliable, and cautious. Since their words and actions can move (gan dong) heaven and earth. If their sincere words and deeds can begin to move heaven and earth, do they not have the same effect with pigs and fishes?
Just like the current handling of the two ‘nuclear’ nations by world leaders and the UN Security Council, if they do not put in more sincerity that can even influence pigs and fishes, they may realize too late what they should have done to avoid an omen or heaven’s secret given by the Yi.