The original Richard Wilhelm translation for the hexagram...
above: K'an / The Abysmal, Water
below: Tui / The Joyous, Lake
A lake occupies a limited space. When more water comes into it, it overflows. Therefore limits must be set for the water. The image shows water below and water above, with the firmament between them as a limit.
The Chinese word for limitation really denotes the joints that divide a bamboo stalk. In relation to ordinary life it means the thrift that sets fixed limits upon expenditures. In relation to the moral sphere it means the fixed limits that the superior man sets upon his actions- the limits of loyalty and disinterestedness.
Limitations are troublesome, but they are effective. If we live economically in normal times, we are prepared for times of want. To be sparing saves us from humiliation. Limitations are also indispensable in the regulation of world conditions. In nature there are fixed limits for summer and winter, day and night, and these limits give the year its meaning. In the same way, economy, by setting fixed limits upon expenditures, acts to preserve property and prevent injury to the people.
But in limitation we must observe due measure. If a man should seek to impose galling limitations upon his own nature, it would be injurious. And if he should go too far in imposing limitations on others, they would rebel.
Therefore it is necessary to set limits even upon limitation.
Water over lake: the image of LIMITATION.
A lake is something limited. Water is inexhaustible. A lake can contain only a definite amount of the infinite quantity of water; this is its peculiarity. In human life too the individual achieves significance through discrimination and the setting of limits. Therefore what concerns us here is the problem of clearly defining these discriminations, which are, so to speak, the backbone of morality. Unlimited possibilities are not suited to man; if they existed, his life would only dissolve in the boundless. To become strong, a man's life needs the limitations ordained by duty and voluntarily accepted. The individual attains significance as a free spirit only by surrounding himself with these limitations and by determining for himself what his duty is.