Hexagram 63, Jì Jì (After Completion): Line 4
既济卦六四 · 水火既济 · 中文版
六四：繻有衣袽，终日戒。
The line (Legge)
The fourth SIX, divided, shows its subject with rags provided against any leak (in his boat), and on his guard all day long.
Small Image commentary
'He is on his guard all the day:' - he is in doubt about something.
象曰：终日戒，有所疑也。
In plain words
Fine silk turns to rags: be on guard all day. Some read the rags as those used to plug a leaking boat. The fourth line has entered the danger of the upper trigram: after completion, one must guard against trouble all the more. The Small Image says this is because there is cause for doubt.
Applying it to your situation
If everything is already going well, this line suggests this is exactly the time to be alert. Where might something good be quietly going bad?
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, Jì Jì changes into Hexagram 49 Gé (Revolution). The Jiaoshi Yilin verse for this change (Chinese): 焦氏易林·既济之革.
The hexagram
Hexagram 63 Jì Jì (After Completion). The Judgment: Ji Ji intimates progress and success in small matters. There will be advantage in being firm and correct. There has been good fortune in the beginning; there may be disorder in the end.
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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.