no one, nothing, none: a complete negative that leaves out every person or thing without exception
This is one of Greek's words for a flat, total "no." A single word does the work of several in English: "no one" when people are in view, "nothing" when things are, "no" or "not any" when it stands in front of a noun, and "not at all" when it colors a verb. The English wording shifts with what is being ruled out, but the idea underneath is always the same sweeping exclusion.
The one thing English cannot show is why this particular form was chosen. Greek has two words that both mean "no one, nothing." This one turns up wherever the sentence is a command, a request, a warning, a wish, an if-statement, or is built around a verb form like "to take" or "taking." Its twin turns up in plain statements of fact. So "tell no one," "take nothing for the road," and "be anxious about nothing" all use this word because each is a command or an instruction rather than a report.
Because the difference between the two Greek words is a matter of sentence type and not of meaning, a reader loses nothing about the sense itself. This is not a stronger or more emphatic "no" than the other form; it is simply the shape the negative takes when the grammar of the sentence calls for it.