This proverb conveys the idea that it is challenging to oversee a large number of people or things without encountering some errors or lapses. Despite all the vigilance in the world, it’s impossible to prevent some elements from deviating from the norm or straying. In English, an equivalent proverb would be: ‘There are always some black sheep in the flock.’ This emphasizes the inevitability of deviations when managing large crowds or multiple operations.