Hexagram 41, Sǔn (Decrease): Line 4
损卦六四 · 山泽损 · 中文版
六四：损其疾，使遄有喜，无咎。
The line (Legge)
The fourth SIX, divided, shows its subject diminishing the ailment under which he labours by making (the subject of the first line) hasten (to his help), and make him glad. There will be no error.
Small Image commentary
'He diminishes the ailment under which he labours:' - this is matter for joy.
象曰：损其疾，亦可喜也。
In plain words
Decreasing one's ailment and letting it mend quickly brings joy: no fault. The ailment stands for a fault. The fourth line is yielding and correct, corresponds to the first, and with its help corrects its own weakness. The Small Image says this too is cause for joy.
Applying it to your situation
If you know you have a fault, this line suggests the sooner you work on it the better. What habit would you most like to change now?
Position
A broken (yin) line in the fourth place, which is a yin (even) place, so it is in its proper place. Its partner is line 1; one is yin and the other yang, so they respond to each other.
If this line moves
With this line moving alone, Sǔn changes into Hexagram 38 Kuí (Opposition). The Jiaoshi Yilin verse for this change (Chinese): 焦氏易林·损之睽.
The hexagram
Hexagram 41 Sǔn (Decrease). The Judgment: In (what is denoted by) Sun, if there be sincerity (in him who employs it), there will be great good fortune:--freedom from error; firmness and correctness that can be maintained; and advantage in every movement that shall be made. In what shall this (sincerity in the exercise of Sun) be employed? (Even) in sacrifice two baskets of grain, (though there be nothing else), may be presented.
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English text: James Legge, The Yi King (Sacred Books of the East, vol. 16, 1882), public domain, as transcribed by the Chinese Text Project. Chinese: the received text. Offered for study and reflection, not as prediction. Plain-English readings and position notes by this site.