Hexagram 43, Guài (Breakthrough): Line 2
夬卦九二 · 泽天夬 · 中文版
九二：惕号，莫夜有戎，勿恤。
The line (Legge)
The second NINE, undivided, shows its subject full of apprehension and appealing (for sympathy and help). Late at night hostile measures may be (taken against him), but he need not be anxious about them.
Small Image commentary
'Though hostile measures be taken against him, he need not be anxious:' - he pursues the course of the due mean.
象曰：有戎勿恤，得中道也。
In plain words
Alert and calling out: even if armed men come at night, do not worry. The second line is strong and central and always watchful: being prepared, it has nothing to fear. The Small Image says this is because it finds the middle way.
Applying it to your situation
If you worry about something going wrong, this line suggests preparing in ordinary times so you need not worry all the time. Are you ready for what you fear most?
Position
A solid (yang) line in the second place, which is a yin (even) place, so it is not in its proper place. It holds the centre of the lower trigram. Its partner is line 5; both are yang, so they do not respond.
If this line moves
With this line moving alone, Guài changes into Hexagram 49 Gé (Revolution). The Jiaoshi Yilin verse for this change (Chinese): 焦氏易林·夬之革.
A recorded case from Takashima
Guai to Ge: exposing or hushing up an agent's fraud: A head clerk returned from a business trip to find the friends he had left in charge had colluded to embezzle funds, inflate prices and falsify the books, and could not decide whether to expose or hush it up. The second line of Guai, "alarm and warning; attack at night; do not worry", led Takashima to advise vigilance without cornering them, handling it firmly but calmly; the clerk did so and it was settled peacefully.
The hexagram
Hexagram 43 Guài (Breakthrough). The Judgment: Guai requires (in him who would fulfil its meaning) the exhibition (of the culprit's guilt) in the royal court, and a sincere and earnest appeal (for sympathy and support), with a consciousness of the peril (involved in cutting off the criminal). He should (also) make announcement in his own city, and show that it will not be well to have recourse at once to arms. (In this way) there will be advantage in whatever he shall go forward to.
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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.