Heaven and water go their opposite ways:
The image of Conflict.
Thus in all his transactions the superior man
Carefully considers the beginning.

The image indicates that the causes of conflict are latent in the opposing tendencies of the two trig rams. Once these opposing tendencies appear, conflict is inevitable. To avoid it, therefore, everything must be taken carefully into consideration in the very beginning. If rights and duties are exactly defined, or if, in a group, the spiritual trends of the individuals harmonize, the cause of conflict is removed in advance.