JMNT(i)
15 Whoever may speak in accord (confess; avow; say like words; say the same thing; agree) that Jesus exists being God's Son (or: is continuously the Son which is God), God continuously dwells (abides), remaining in him, and he himself within God.
16 And we have come by intimate experience to know and have believed, trusted and are convinced of the Love which God has (or: holds) continuously within (or: among) us. God exists continually being Love (God is Love), and the person continuously remaining (dwelling; abiding) within, and in union with, the Love, is continuously remaining (dwelling; abiding) within, and in union with, God – and God constantly dwells (remains; abides) within him and in union with him.