Hexagram 25, Wú Wàng (Innocence): Line 4
无妄卦九四 · 天雷无妄 · 中文版
九四：可贞，无咎。
The line (Legge)
The fourth NINE, undivided, shows (a case) in which, if its subject can remain firm and correct, there will be no error.
Small Image commentary
'If he can remain firm and correct there will be no error:' - he firmly holds fast (his correctness).
象曰：可贞无咎，固有之也。
In plain words
One can remain steadfast: no fault. The fourth line is yang in a yin place, strong but not central; the first line is also yang, so there is no correspondence, and rather than acting rashly it keeps to its place. The Small Image says this is something it already has.
Applying it to your situation
If you are not sure whether to act, this line suggests simply holding on to what is already yours. What do you already have that is worth protecting?
Position
A solid (yang) line in the fourth place, which is a yin (even) place, so it is not in its proper place. Its partner is line 1; both are yang, so they do not respond.
If this line moves
With this line moving alone, Wú Wàng changes into Hexagram 42 Yì (Increase). The Jiaoshi Yilin verse for this change (Chinese): 焦氏易林·无妄之益.
The hexagram
Hexagram 25 Wú Wàng (Innocence). The Judgment: Wu Wang indicates great progress and success, while there will be advantage in being firm and correct. If (its subject and his action) be not correct, he will fall into errors, and it will not be advantageous for him to move in any direction.
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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.