καὶ ἐν τούτῳ γινώσκομεν ὅτι ἐκ τῆς ἀληθείας ἐσμέν, καὶ ἔμπροσθεν αὐτοῦ πείσομεν τὰς καρδίας ἡμῶν,

1. καὶ
   and
2. ἐν
   in
3. τούτῳ
   this
4. γινώσκομεν
   we know
5. ὅτι
   that
   because
6. ἐκ
   from
   out of
7. τῆς
   of the
   the
8. ἀληθείας
   truth
9. ἐσμέν
   we are
10.  
    ,
     
11. καὶ
    and
12. ἔμπροσθεν
    before
13. αὐτοῦ
    his
14. πείσομεν
    we will persuade
15. τὰς
    the
16. καρδίας
    heart
17. ἡμῶν
    our
18.  
    ,
     

And by this we know that we are of the truth, and we will persuade our hearts before him,