Hexagram 4, Méng (Youthful Folly): Line 1
蒙卦初六 · 山水蒙 · 中文版
初六：发蒙，利用刑人，用说桎梏，以往吝。
The line (Legge)
The first SIX, divided, (has respect to) the dispelling of ignorance. It will be advantageous to use punishment (for that purpose), and to remove the shackles (from the mind). But going on in that way (of punishment) will give occasion for regret.
Small Image commentary
'It will be advantageous to use punishment:' - the object being to bring under the influence of correcting law.
象曰：利用刑人，以正法也。
In plain words
To open up ignorance, it is favourable to use punishment to set people straight, and to remove the shackles in time; to go on this way brings regret. The shackles are fetters for the feet and hands. At the start of teaching, clear rules are needed, but rules are there to set people on the right path, not to manage them with punishment for ever. The Small Image says punishment is used to set the law right.
Applying it to your situation
If you are bringing on newcomers or teaching a child, this line suggests setting clear rules at the start, without letting them become a lasting restraint. Which rule has done its job and could now be loosened?
Position
A broken (yin) line in the first place, which is a yang (odd) place, so it is not in its proper place. Its partner is line 4; both are yin, so they do not respond.
If this line moves
With this line moving alone, Méng changes into Hexagram 41 Sǔn (Decrease). The Jiaoshi Yilin verse for this change (Chinese): 焦氏易林·蒙之损.
A recorded case from Takashima
Meng to Sun: Tanaka Heihachi entrusts his brother to Takashima: Tanaka Heihachi wanted to place his wayward younger brother in Takashima's household to be straightened out, and the cast gave the first line of Meng, "to lift ignorance, use discipline". Takashima read it as setting firm rules and keeping the young man at home, and foresaw that the mother would find it too strict.
The hexagram
Hexagram 4 Méng (Youthful Folly). The Judgment: Meng (indicates that in the case which it presupposes) there will be progress and success. I do not (go and) seek the youthful and inexperienced, but he comes and seeks me. When he shows (the sincerity that marks) the first recourse to divination, I instruct him. If he apply a second and third time, that is troublesome; and I do not instruct the troublesome. There will be advantage in being firm and correct.
Next: Line 2
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.