ἐν 
En 
By
τούτῳ 
Touto 
γινώσκω 
Ginosko 
we know
ὅτι 
Hoti 
ἀγαπάω 
Agapao 
we love
τέκνον 
Teknon 
θεός 
theos 
of God
,
ὅταν 
Hotan 
ἀγαπάω 
Agapao 
we love
θεός 
theos 
,
and
τηρέω 
Tereo 

The Holy Bible, English Standard Version® copyright © 2001 by Crossway Bibles, a publishing ministry of Good News Publishers.