John closes his letter, reviewing what he has said about the new nature of believers, which cannot sin, and he reminds them to keep themselves from idols.
Lying in someone's power represents being controlled or ruled by him. AT: "the whole world is controlled by the evil one" (See: [[rc://en/ta/man/translate/figs-metaphor]])
Here "world" is a way in which some biblical writers refer to the people living in the world who are in rebellion against God and to the world system that is affected in every way by the corrupting power of sin. (See: [[rc://en/ta/man/translate/figs-metonymy]])