It means to be careful when you are alone. Living alone without supervision needs to be cautious and consciously abide by various moral standards.

2. Source:

Dai Sheng, a scholar of rites in the Western Han Dynasty, The Book of Rites: This is called sincere appearance, and a gentleman must be cautious and independent. It means that the inner truth must be displayed outside. Therefore, people with high moral character must be cautious even when they are alone.

3, antonym:

Carelessness:

Meaning: words and deeds are arbitrary; Not careful or serious.

Source: Ming Di's "Annals of Southern Song Dynasty Articles": indiscreet in sex, with no attention to details. It means that Xie Shang is free and easy and doesn't care about details.

Synonym:

1, caution:

Meaning: It means to be cautious.

Source: The Biography of Han Yu Ding Guo: Its legal meaning of doubt is to mourn its widowhood, to be less guilty and to be cautious. It means that he takes care of widowers and widows as much as possible when solving crimes and enforcing the law, and will be lenient (handling) and cautious (at any time) for any doubts that cannot be decided.

2. Be careful:

Meaning: Cautious and earnest.

Source: Su Shi's "Try to be a Imperial Examiner's Plan" in the Song Dynasty: Caution leads to success, and those who are light lose more. It means to be careful and you will succeed; Make a rash move and things will probably fail.