'Continuing' in the Bible

The man who professes to be continuing in Him is himself also bound to live as He lived.

And as for you, the anointing which you received from Him remains within you, and there is no need for any one to teach you. But since His anointing gives you instruction in all things--and is true and is no falsehood--you are continuing in union with Him even as it has taught you to do.

Every one who hates his brother man is a murderer; and you know that no murderer has the Life of the Ages continuing in him.

We can know that we are continuing in union with Him and that He is continuing in union with us, by the fact that He has given us a portion of His Spirit.