en_tn_lite_do_not_use/jhn/04/53.md

So he himself and his whole household believed

The reflexive pronoun "himself" is used here to emphasize the word "he." If you have a way of doing this in your language, you may consider using it.

sign

Miracles can also be called "signs" because they are used as indicators or evidence that God is the all-powerful one who has complete authority over the universe.