καὶ αὕτη ἐστὶν ἡ ἐπαγγελία ἣν αὐτὸς ἐπηγγείλατο ἡμῖν, τὴν ζωὴν τὴν αἰώνιον.

1. καὶ
   and
2. αὕτη
   this
3. ἐστὶν
   is
4. ἡ
   the
   or
5. ἐπαγγελία
   promise
6. ἣν
   was
7. αὐτὸς
   himself
   he
8. ἐπηγγείλατο
   promised
   he promised
9. ἡμῖν
   to us
   us
10.  
    ,
     
11. τὴν
    the
12. ζωὴν
    life
13. τὴν
    the
14. αἰώνιον
    eternal
15.  
    .
     

And this is the promise that he himself promised to us, the eternal life.