en_tn/1jn/05/18.md

We know that

"We" refers to all believers. (See: rc://en/ta/man/translate/figs-inclusive)

does not sin

"does not habitually sin." (UDB)

whole world lies

"World" is a metonymy which refers to the world system ruled by Satan. (See: rc://en/ta/man/translate/figs-metonymy)

in the evil one

"Evil one" is a metonymy which refers to Satan. (See: rc://en/ta/man/translate/figs-metonymy)

and the whole world lies in the evil one

This can be translated “Satan controls all the unbelievers in the world.”