ἐὰν εἴπωμεν ὅτι οὐχ ἡμαρτήκαμεν, ψεύστην ποιοῦμεν αὐτόν, καὶ ὁ λόγος αὐτοῦ οὐκ ἔστιν ἐν ἡμῖν.

1. ἐὰν
   if
2. εἴπωμεν
   let us say
   we say, let us speak
3. ὅτι
   that
   because
4. οὐχ
   not
5. ἡμαρτήκαμεν
   we have sinned
   we sinned
6.  
   ,
    
7. ψεύστην
   liar
8. ποιοῦμεν
   we do
   we make
9. αὐτόν
   him
10.  
    ,
     
11. καὶ
    and
12. ὁ
    the
13. λόγος
    word
    reason, logic
14. αὐτοῦ
    his
15. οὐκ
    not
16. ἔστιν
    is
17. ἐν
    in
18. ἡμῖν
    to us
    us
19.  
    .
     

If we say that we have not sinned, we make him a liar, and his word is not in us.