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During their journey to the West to obtain Buddhist scriptures, Tang Sanzang and his three disciples passed through Pingding Mountain.
There, they encountered a woodsman, who was actually a small immortal in disguise. He told them that two very powerful demons in the Lotus Cave ahead were waiting to eat Tang Sanzang's flesh.
Even the formidable Sun Wukong, showing a bit of recklessness, decided to confront the demons without fully knowing their true power. However, Sun Wukong cleverly used his wits to subdue these two demons.

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Open the tool →不知深浅 (bù zhī shēn qiǎn) is a Chinese idiom (chengyu) meaning “to lack understanding of the complexities, difficulties, or potential dangers of a situation; to be unaware of the gravity of things; to be imprudent or reckless”.
不知深浅 is pronounced bù zhī shēn qiǎn in Mandarin Chinese.
Literally, 不知深浅 means “not know the depths or shallows”. It is used to mean “to lack understanding of the complexities, difficulties, or potential dangers of a situation; to be unaware of the gravity of things; to be imprudent or reckless”.
不知深浅 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
原意是不知道水的深浅。后多用以形容不懂得事情的利害。